BEFORE YOU DO ANYTHING THAT WILL MESS UP YOUR CHANCES OF A SIMPLE RECOVERY.
Use the OS file manager to search for metadata.db
(there should be 1 for each Library you have)
does The folder that it is in have lots of folders with AUTHOR names?
That is a Library. Note the path.
Now in Calibre. right-click the Library Icon: Switch/Create: USE EXISTING: navigate to where the metadata.db was found
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