The Battle of Winterfell has come and gone, the Night King and his minions have turned to dust, and things are looking up. While the key players of this epic showdown were Arya, Theon and Jorah, several other characters had their own bits to perform. Jaime Lannister for instance, fought valiantly alongside Brienne.
He returns to King's Landing and rejoins Cersei.
Another option is that he stays on in Winterfell, helping them rebuild and ultimately fighting Cersei's army.
He might just continue to help the people of Winterfell, doing his part to rebuild everything they lost.
One theory is that he fulfills the destiny that many have suggested, that of Azor Ahai.
While there was a theory that suggested Jaime would have to plunge his sword into Cersei's heart to become Azor Ahai - the Prince that was Promised - this has obviously not yet occurred. However, there is a moment during the battle where Sam notices Jaime fighting amongst the flames, and the camera lingers for just a little longer than usual.
There's also the chance that he's executed for the crimes of his past.
This is another obvious option - he's executed. Either because someone finds out that he pushed Bran off the window, or because he killed Dany's father. Let's just hope it doesn't come to that conclusion.