Sam tells Jon he’s not a Stark (oh wait, ya he’s even more of a Stark, but now has popularity issues). Drama ensues. Sansa leads the Starks.
Big battle in the North eliminates all three dragons and and most of Daenerys’ forces and seems to defeat the ice king but now they have no advantage over the Lanisters.
Lanisters hire mercenaries and consolidate southern Westeros but not Dorn.
The north defends the Dreadfort but is outmaneuvered by Lanister forces arriving by sea.
Theon finds his uncle and challenges him to single combat, and beats him with his amazing inability to be stunned by knees to the groin. They both die from ridiculous overuse of head-butt attacks with no helmets on, and Theon’s sister takes over the Iron fleet.
Lanister army is in a position to win (if Daenerys’ forces weren’t taken out in the North, they are by surprise wildfire), but Jamie made friends in the north, and with the help of Jamie, Theon’s sister (who possibly rescues and fools around with the Dornish queen, unless the Dornish queen dies trying to kill Cersei first), the Onion Knight, Tyrion and Varys, the Hound and Arya sneak in and take out the Mountain and Cersei. Jamie probably dies along the way, leaving the Lanisters leaderless.
Gendry for king.
Daenerys lays an egg.
(Just a guess.)