So many ways this can be epic.
Jon is super pissed about saving everyone and he gets screwed for doing so. So he starts a new war for the throne.
The Iron Bank is super pissed about being on the wrong side of the war and they assassinate Sansa / Bran / anyone from House Stark and only Jon is left.
Jon unites the free folk and establishes a new house. He demands the new house is recognized by the existing 7 and political shenanigans start leading to a new war.
The white walkers beyond the wall were severed from the Night King and they still exist. Jon must deal with them as they threaten his people.
Grey Worm ultimately can't get over Jon's decision to save the kingdom and he sends the unsullied north.
Bran is actually a complete ******* who orchestrated the entire last two seasons with his ability to see the future. Bran the Broken turns into Bran the Tyrant, where he uses his ability to see the future to preemptively strike against those he dislikes. Ultimately Jon Snow must again strike against the people he loves to save the kingdom.