I don't remember if I used nostur lately.
You must have signed into a new app that overwrote your follow list. 😟
Some ways to fix…
If you’ve ever used nostr:npub1n0stur7q092gyverzc2wfc00e8egkrdnnqq3alhv7p072u89m5es5mk6h0, it will automatically detect a change in your follow list and offer to restore it for you.
One of these sites may also help you recover it:
Discussion
If you still have it installed, open it up and wait a couple of minutes for it to compare your follow list with what it has stored locally.