I too am going from Apple Music to self-hosted.

Personally I run Navidrome on my server. It has a web player for computers and play:Sub has been my mobile player of choice. Also supports offline downloading to your device. Super lightweight as well.

• For acquiring music either I use Freyr-js (which finds the highest quality copy from Youtube/Youtube Music), Nicotine+ (frontend for soulseek) or check against Bandcamp and Soundcloud to see if your artists have uploaded there. Of course always support your favorite artists if you can, if not then 🤷‍♀️.

If the tags for the music files are incorrect, I use Kid3 to correct them.