Really old library
I used zotero a long time ago--like a decade ago--and loved it! Now I'm back on a new project, and can't find my old library. I assume it's been deleted, but just in case there is a way to recover it I'd be very interested to know how to do that. Thanks!
If you synced it, it'd be visible under "My Library" here and simply syncing again would bring it back (at least your account is >10 years old, so that's possible).
If you didn't sync, you'd need to find your old Zotero data folder https://www.zotero.org/support/zotero_data#locating_missing_zotero_data
If you find it, see further up that page on using it to restore your old library.
Without either of those two things, I'm afraid it's gone.
I do seem to have two accounts--two different usernames, somehow. They may be almost identical. Is there any way to merge the two?