cannot sync libraries

Dear all,
when I try to sync my libraries I received the warning "You have reached your Zotero File Storage quota. Some files were not uploaded. Other Zotero data will continue to sync to the server.". I deleted one of my group libraries that was very big and that I didn“t need anymore. However, nothing changed, I deleted more folder, but still I cannot do more syncing. Any idea what the problem here?

Best,
Gabriela
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