I used to use Apple Music, and never brought playlists over. Also used Spotify and TIDAL, but recommendations were never great on any of these.
There’s a python application for managing the meta data better than lidarr called beets
. You need to be familiar with a terminal, but it has a ton of plugins and options. If you want a GUI, try MusicBrainz Picard, but it’s old and not great on really big libraries. For playlist suggestions, plexamp can do that, but only for music you already have.