Close Calibre and remove the library from Google Drive.
Open Calibre again. Go to Preferences > Run Welcome Wizard and the folder to your new library folder.
Then run Library > Library maintenance > Restore database. Expect this to take a while, a few hours at least. This will rebuild the database from the OPF backups.
If this doesn't work:
Create a new library. Do not put it in Google Drive.
Use Add from Folders and Subfolders and select your old library folder. This'll add your books to your new library.
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