Help to recover Book Catalogue

In 2017 I and two volunteers worked on cataloguing the Four Winds Storytellers Library, a 6000 volume research library I run for storytellers.
I was unable to continue the catalogue until recently. When I opened Zotero, it had no trace of the work done two years ago.
Can anyone tell me what I did wrong?
Or how to fix this, I hope?

Norman Perrin
Four Winds Storytellers Library
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