What would I have done? Well, I would have started by showing D&D the door when they refused to do 10 episodes each in season 7 and 8. Then I would have asked Cogman to be showrunner, and if he needed more seasons to tell the end of the story properly.
Amen.
But in all seriousness...as much as I disliked the endings...there are much better ways D&D could have gotten there as well as give pay outs to the story threads they had established in Season 6 and 7.
So here we go!
First off...season 7 is ten episodes.
1 & 2: Same
3: Same. Except Jon also mentions Rhaegar "kidnapping & raping" Lyanna which throws Dany off guard completely. She looks to Varys who sadly nods and confirms what Jon said.
4: Jon/Dany start actually getting to know one another. Its clear that while they dont' completely trust one another...they seem to get along. Tyrion and Dany muse about a marriage alliance. Tyrion suggests that it would be a good way to mend the bad blood between the Targs and Starks. Dany is lukewarm on the idea but she concedes that she knew she would have to marry once in Westeros. And they joke that she could do far worse than Jon Snow. We get the cave scene. Episode ends with Dany leading the Dothraki against Jamie. Sansa and Arya start to "bond" again and realize that Baelish is up to no good.
5. First half is Dany & Dothraki vs Lannisters. Goes about the same. Except Bron gets mortally burned by Drogon and dies. Jamie manages to make it back to KL and is freaking out. Dany arrives back and DS, Jorah shows up. Jon gets word back from Winterfell that Arya and Bran are alive. Jon and Dany have a discussion about siblings. And Jon & Jorah talk about Jeor. Much to Dany's surprise Jon and Jorah get along rather well and it makes her happy. Varys informs her that due to Ellaria and the Sand Snake are missing, Dorne is in a bit of a succession crises and due to Olenna's death the Tyrells are no more. Her allies and dwindling so she needs the support of the vale, the north and the riverlands.
6. More Jon and Dany. Jon receives word from Bran that the NK is on the move. They come up the "brilliant" plan to go catch a wight.on receives word from Bran that the NK is on the move. They come up the "brilliant" plan to go catch a wight.
7. tyrion meets with Jamie, Davos brings Gendry back. Jon and Gendry bond. Dany is moody that Jon is leaving. Also enter new Dornish Prince.
8. Episode begins with the Snowicide Squad going beyond the wall and ends with them trapped on the lake. Meanwhile Dany tries to win additional allies in Westeros. Introduce the Hightowers.
9. Dany goes off beyond the wall to save Jon and Co.
10. The meeting at the Dragonpit/Jon parent reveal/Boatsex/trial of littlefinger
Really all Season 7 needed was better pacing toward the end. Splitting up beyond the wall into episodes 8/9 makes things flow better. Also giving Jon and Dany two more episodes of them interacting sells us better on them being in love. And makes Jon's decision to go get the wight more heartbreaking for Dany.
Season 8.
1-3: If you REALLY wanted too. You could keep these episodes pretty much the same, BUT Jon should have his showdown with the Night King. He doesn't have to actually beat the Night King. But for Godzilla's sake at least give us a fight between the two. Arya can still come in and kill steal it. Or better yet. Have NK beat Jon go in for the kill, Arya does her ninja attack and Knife trick and Both Jon and Arya stab the NK.
4. This episode needs to be PURELY about the Post Long Night. It needs to be about Jon coming to terms with his parents. Have Bran show Jon the past of Rhaegar and Lyanna. Jon accepts this and starts to accept who he is. Dany also drops the boat baby bomb on him. He tries to be a bridge between his sisters and Dany...and unfortunately its not working. Dany's becoming paranoid, Sansa power hungry, and Arya just starts dissociating from everyone. Episode ends with Jon telling his sibs the truth of his parentage and that he plans to marry Daenerys.
5-7. The KL fiasco. You can keep the deaths, but instead of Dany getting triggered by Bells. Have Cersei go mad and burn the city with wildfyre. But have the people debate on whether it was cersei or dany who caused the city to burn. Arc ends with Dany ascending the throne.
8-10. Dany vs Westeros/Sansa/The wheel.
Act I
Dany focuses on rebuilding KL and plans her marriage to Jon. Meanwhile Sansa starts playing her game to get rid of Dany. Tyrion is becoming more skeptical while Jon really starts to REALLY REALLY dislike politics. Tries to convince Dany that they should just leave on Drogon's back to go live in peace. Dany says, they'll always hunt us. Jon relents. The two get married. Dany is over the moon, Jon is happy but worried.
Act II
Dany gives birth to their child. Both are happy, but the people start complaining about the Dothraki and Unsullied. The Dothraki ended up settling in the Reach. And the Unsullied act like a occupying force. Tensions are thick. Sansa schemes. The Dothraki cause problems, Dany is forced to use Drogon to put down an uprising. She's is forced to send them back.
Act III
Sansa sees that Dany's power is weakened so she convinces Arya to kill Dany. Arya goes to kill the Queen, but Jon stops her. Tells her if she wants to kill Dany, she has to kill him. Arya runs, but Dany tells Jon it's too late. And that she's been poisoned by Tyrion. Its a slow acting poision that will eat away at her and drive her crazy. Jon grants her a merciful death. And then escapes with their child to go live with the Free Folk. Tyrion is held on trial and sentenced to Death. Bran becomes King, Sansa becomes Queen of the North but Ayra tells her that she's the lone wolf now and that Sansa will die alone and sad.