Hi there - sounds like you may have done a full sync in the wrong direction and thus synced your empty collection out to AnkiWeb
https://github.com/ankidroid/Anki-Android/wiki/FAQ#lost-my-cards
You may want to get back on the older cell and full sync your full (vs empty) collection back out to AnkiWeb?
Otherwise, maybe (I do not know) ankiweb can restore, that's a question for their FAQ and/or https://forums.ankiweb.net
Hope something there helps recover your collection
-Mike
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