Who would've thought Sansa would end up in the Vale tho..
What I'm hoping for:
Sansa becoming Lady of the Vale (through marriage)
She should march her army to the North to fight the Boltons
Rebuild Winterfell and become Lady of Winterfell (Stark through her father's line).
Get support of the rest of the Lords of the North
After defeating House Bolton she should march her army with bannermen of The Vale + The North to The Twins to defeat Walder Frey.
Edmure Tully should die so she can become Lady of Riverrun (Tully through her mother's Line).
Get support of the Lords of the Riverlands.
After Brienne found her Sansa needs to send Brienne to Dorne/ The Reach to negotiate with House Martell and House Tyrell (I bet Olenna can make an alliance happen).
Then Sansa attacks with her huge army of bannermen (north, vale + riverlands) the southern land, while the armies of Dorne and the Reach attack the northern land.

Sansa belongs on that throne tbh