How to safely update my old iTunes library & migrate to Music
So I have a large iTunes library with tons of playlists that I do not want to lose. Years ago, I subscribed and to Apple Music, synced my library, and then lost all of my playlists when I unsubscribed (many came up blank or could not find the music).
Recently I was able to restore my music library from a backup to a 2012 Mac mini running High Sierra (had previously tried transferring the folder to my 2020 MacBook but could not get it to work, the playlists would show up but it could not find any of the music).
I want to be able to safely upgrade this library and transfer it to my MacBook but am not sure the best way to go about it. Should I simply upgrade the Mac Mini to Catalina and then try transferring it from there? Is there any precautions I should take before upgrading the Mac Mini from High Sierra to Catalina? Is there a better way of going about this? The back up I have is quite old, I think from around 2015. It is simply a copy of my old music folder.
Any help would be so much appreciated. Thanks
Mac mini, macOS 10.13