All Music Gone

I recently updated my software to MacOS Catalina 10.15.6. I let it update and reset. When I booted it back up and opened Music, only the files that I had bought and downloaded from the Apple Music Store appeared. All of my playlists were gone, everything else was gone, save for those songs that I had previously mentioned.

I want to know how I can get things back to how they were. It was all taken off without warning and I could not trace a cause. All of the music was there before the update, now it is not. Please advise further. Thank you.