I used to love Game of Thrones, especially for the first four seasons or so. As the show started to run out of books, it became more and more of a mess.
I hated about 50% of season 6 and about 90% of season 7.
What did I hate about season 7? In no particular order:
The “romance” of no chemistry or point; the wight hunt for no reason; Dany being pretty blasé about losing a dragon (even though they are the ONLY reason she has any armies at all) because she finds her nephew dreamy; Tyrion, all of a sudden, being a complete idiot because the plot requires him to be dumber than Jaime; the Winterfell junk; Bran announcing that Jon is Lyanna’s son-again- even though it was already figured out to end the previous season; Show Jon being dumb, dumb, dumb when Book Jon is not (he’s ignorant, but learns. All of ADWD, that dude is making compromises and strategizing) ; Jon leaving Sansa in charge, forever, because the plot required him to; Suddenly remembering that Dragonstone has dragon glass, even though Stannis said as much to Sam in season 5; Dany not taking the Iron Throne, even though she has a much bigger army than Cersei and dragons; “Aegon Targaryen” when Rhaegar already has a son named Aegon, who at the time of Jon’s birth, is still alive; shooting the far away dragon instead of the closer, much bigger dragon on the ground; the damn dragon chains!!!!
Generally, that the show has become completely about shock and spectacle and not at all about character.
So, here is how I'd fix it.
First, a few adjustments in previous seasons:
Jon Snow is a warg, as he is in the books. He is able to warg into his wolf.
Val, the Wildling Princess in the books, is a character in the show. Jon meets her at Hardhome and she travels with the rest of the Wildlings through the Wall. She is present for his resurrection. She has a more defined role in the show- she's a figure close to a völva , she understands and is well-versed in all the magic of the North and the old gods (warging, green seeing- she may be a warg herself.) She is also trained in negotiating and mediation in wildling culture and helps integrate the Free Folk south of the Wall. She and Jon become lovers before the fight for Winterfell. She is also close with Sansa. (She's my favourite minor book character- I'm putting her in the show- if only for this line: "Lord Crow is welcome to steal into my bed any night he dares. Once he's been gelded, keeping those vows will come much easier for him.")
Jon let Rickon die in the Battle for Winterfell. It causes him a lot of grief. He also has a lot of pain (from being stabbed) and angst about his resurrection. He's not as he was in earlier seasons.
Sansa told Jon about the Knights of the Vale. He spent much of that battle stalling for their arrival.
Jon had to show his stab wound scars to the assembled lords after the battle is won to demonstrate that he has not broken his Night's Watch vows. It's a trial scene and some explanation about how/why he deserted.
Jon is not crowned King in the North. Instead, he supports Sansa as Lady of Winterfell and is her war leader. He advises her and they are partners, but she is recognized as next in line as Ned's heir, her brother Robb, died without an heir.
Ghost is a thing again.
The Sand Snakes are not in the show, but rather Arianne Martell is a character. Dorne is so awesome in the books, but other than Oberyn, was a complete waste of time in the show. A strong, interesting Arianne fixes this.
Littlefinger is shoved off a cliff by Sansa.
Now, toss out nearly everything in season 7.
Instead, this general outline over two seasons:
Sansa, though Lady of Winterfell, finds it very difficult to live at Winterfell due to the trauma she endured there. She and Jon decide that, in an effort to prepare for the Night King fight, she and a small party (including Brienne) will go to an abandoned Dragonstone to mine dragonglass and have it shipped north. Davos suggests that Pod seek out Gendry in King's Landing to recruit him to make weapons out of the dragonglass. Having a specific and vital task away from Winterfell helps Sansa heal. The party is very small so as not to attract attention.
Jon will stay north to oversee other preparations and the training. He also negotiates with the Northern lords on behalf of Sansa (more or less what Book Jon told Stannis to do in ADWD.) Val helps him and advises him in his negotiations.
Sansa is at Dragonstone when Dany, plus armies and dragons, arrives. Sansa is taken hostage as a bargaining chip to get the North in line. Sansa and Tyrion reunite, and he notices how different she is.
Dany fights the same "Field of Fire" battle against the Lannister forces, but she takes all three dragons. Viserion is killed, but Dany takes King's Landing and the Iron Throne.
Cersei survives, but escapes King's Landing with Jaime. For the first time since the first few episodes of the series, Cersei has left the city and is on the run.
Sansa is, once again, a hostage in King's Landing, though with different captors. Nothing particularly terrible happens to her, she just can't leave.
Dany summons Jon Snow south to bend the knee in exchange for Sansa.
Before Jon can leave Winterfell, Bran shows up and tells him all about his heritage, who his parents are and that he is a Targaryen. Bran also tells Jon that he is no longer Bran Stark and cannot be Lord of Winterfell.
Few other things: Rhaegar didn’t get an annulment, he just took Lyanna as a second wife, as Targaryens, including Aegon the Conqueror, have done. Sam could just explain that, find proof of second marriage rather than an annulment. It’s not a secret that Targs do that. Jon's real name is not Aegon, because Rhaegar already had a son named that and also that’s dumb.
Jon, plus Val and Davos, rides south with that knowledge. Val tells him that he's got the blood of the First Men (which allows him to warg) through his mother, Lyanna as well as the blood of the dragon through his father, Rhaegar.
The idea of another Stark daughter (as well as Lady of Winterfell) being kidnapped by a Targaryen fires up the Northern lords and they rally around Jon Snow.
Jon arrives in King's Landing to negotiate with Dany for the release of his sister. He agrees to bend the knee but also requests Dany's aid in his fight against the Night King. Having just won her throne, Dany is reluctant to leave King's Landing for, in her eyes, a vague threat.
Val discovers that Dany has only ever ridden her largest dragon Drogon, but doesn't have as close a bond with her other remaining dragon. Val also discovers that the dragon is named Rhaegal, named for Rhaegar (Jon's newly discovered father.)
Val suggests that Jon may be able to warg into the dragon, as he has warging abilities from his northern roots as well as dragon blood. He is successful and the two bond. Dany is unaware of this and dismisses them. They all (Sansa included) take their leave but as they head north, Jon calls Rhaegal to follow them. Jon does this both because he wants the dragon against the Night King but also to encourage Dany to come North to retrieve it.
Arya has ridden south from killing the Freys at Riverrun in hopes of catching up with Cersei.
Meanwhile. Cersei is on the point of getting the Iron Bank (which has serious concerns about Dany and her dragons) to pay for sell swords and dragon killing siege equipment.
Jaime and Cersei argue, and Jaime kills Cersei. When Cersei is dead, it is revealed that Jaime is actually Arya wearing Jaime's face. Arya has killed Jaime to get close enough to Cersei to kill her.
Dany is incensed when she discovers that Jon has taken Rhaegal, especially since she lost Viserion getting the Iron Throne. She, plus Drogon and armies, head north to confront Jon and Sansa.
Arya, with her kill list complete, rides/sails north with Dany's army wearing the face of a Dothraki. She has the idea to assassinate Dany when she hears that Dany is heading to confront Jon and Sansa, but she isn't able to get close enough.
While this is happening, Bran didn't realize that passing back through the Wall has diminished it's magic repellant. The Night King and his army is now able to climb the Wall. The Night King's army has marched south to meet the Northern army, leaving disaster it's in wake.
Dany arrives at White Harbour and finds it annihilated. Jorah tells her this was once a thriving city, so she understands that something destructive and malevolent is at play.
Dany meets up with Jon Snow and recognizes that Rhaegal and Jon are bonded. Rhaegal will not allow harm to come to Jon, and she does not want to kill Rhaegal. Drogon will also not fight Rhaegal. She recognizes that Jon is her brother Rhaegar’s son, which Bran confirms.
They agree to a cease fire and to fight together to stop the Night King.
Arya reveals herself to Sansa and Jon. They are reunited.
Showdown with Night King- mass casualties, including both dragons and Ghost, Jorah and possibly Arya, but the Night King is defeated.
Dany recognizes that Jon is heir to the Iron Throne, but Jon allows her to take it by right of conquest. Partly because they respect each other and partly because both their armies are depleted and neither has a dragon, they compromise and split the Seven Kingdoms in half.
Jon gets crowned King in the North and gets the North (including what was Beyond the Wall), the Riverlands, the Vale.
Dany is crowned Queen in the South, gets the Crownlands, the Stormlands, the Reach, the Westerlands.
And technically, Dorne but Dorne is a pain in her ass for a couple of decades. The Sand Snakes silliness from the show aren’t a thing, but rather Arianne Martell is central to all of this Dornish uprising.
The Iron Islands becomes its own kingdom, as was agreed.
Jon makes Sansa in charge of the Vale and the Riverlands. Dany grants Tyrion Casterly Rock.
The Dothraki return to the East, but the Unsullied remain as Dany’s city guard.
Dany can’t have a child and becomes obsessed Asshai and Valyria. She searches for more dragon eggs. She never finds them. She’s a good queen but not a happy one. She sometimes dreams of returning east, which is ironic as when she was east, she dreamed of the Iron Throne.
Jon marries Val in front of the heart tree at Winterfell. Dany eventually names their second born, a daughter, her heir.
Jon is faded/ distant and his stab wounds ache, he is in near constant pain- maesters suspect it’s due to his resurrection, the loss of so much of his family, and the loss of his wolf. There is a sadness in Jon.
The magic that rose up to counter the Night King recedes, and Westeros becomes more rational. Out of the Middle Ages, into the Renaissance. Like England after the War of the Roses.
Sansa is very, very happy in charge of things. The Riverlands love her because she looks so much like Catelyn and they are reminded of House Tully. Sansa marries someone very nice. And they all eat lemon cakes.