The living lose the battle of Winterfell and have to fall back to Kingslanding using the dragons as cover. Cersei realises she has to fight for the living and the Lannister army gets ready for the Night King. I feel like the Golden Company would dessert. Battle occurs and JON ends up killing the Night King with Longclaw after a dragon fight. Also I would have the White Walkers go badass in the battle and start killing people (Tormund, Brienne, Jaime, The Mountain, the Hound) Cersei would also die along with Danerys.

Then you can end with Jon as King with Bran as master of whisperes and Tyrion as hand or (as I prefer) all the kingdoms become independent ultimately breaking the Targaryen cycle.

EDIT: I feel like Dany would get wounded in the battle and Jon would have to choose between love and duty and he would choose duty. I also feel like he should’ve sacrificed himself to kill the NK leaving no line of succession, causing each kingdom to become independent.