[2021] all saves corrupt

I've got myself in a right mess, firstly in the view from above quest, the dialog with Loki and the Builder wouldnt load, so i gave up and went home.
then a quest with freeing the wolf wouldnt load properly, then i un installed and re installed the game, and now all my saves are corrupt and it's saying i have to start a new game. I've basically finished the main story line so it would be a real shame to have to restart.

any ideas on how i can load a previous cloud save would be greatly appreciated

Thanks!