have you tried restoring from local backups?
anki keeps 50 local backups for each profile by default.
click on “open backup…” on profile screen and see if you can get your cards back
make sure to copy all these backups to some other drive before trying to restore (just to make sure you don’t mess them up trying to restore)
(located in: C:\Users\ USER \AppData\Roaming\Anki2\ PROFILE NAME)