How to Recover a Damaged Music Library on macOS

I booted up my laptop today after it had been powered down for the better part of a week, and tried to open the Music app. Opon launch I got a warning window that said the app could not load my Music Library because it was damaged, and a new one would be created. The OS made a new library and renamed the old one "Music Library (damaged)."

Upon launch of the app, my Music Library was empty. I'm a radio DJ, so my collection has over 11,000 albums and hundreds of playlists. Yet, the app showed that I had zero tracks of any kind, no playlists, nothing.

My last Time Machine backup was a day before I last shut the laptop down last week, so I restored the previously backed up library and put in the Music folder. I copied the two previous libraries to a different external drive, and unmounted it. When I restarted the app, it ignored the older library and created a new copy of the newer library. So far, this is where I'm stuck.

Can anyone tell me what steps are necessary to get the app to recognize the older library and restore my collection?

I'm running Ventura 13.6.4 on my 2017 MacBook Pro, the newest OS that will run on my system.

Many thanks!

[Re-Titled by Moderator]