If you just want to play music locally without hassles, there are a slew of music apps that can do it for you, my personal favorite is Musicolet.
If you wanna get fancy you could always spin up your own music server with navidrome, and combine that with the android app Symfonium (what i currently do). If you don’t like the idea of always streaming your music, for example if you have bad internet service outside your home, you can temporarily or permanently cache music to your phone.
I used a free online service to rip my Spotify playlists to MP3s. Now what? (for Android)
Musicolet
You have a bunch of mp3s? Just add them to an app that plays mp3s like Winamp
Navidrome + any of a number of subsonic players
If you just want to play music locally without hassles, there are a slew of music apps that can do it for you, my personal favorite is Musicolet.
If you wanna get fancy you could always spin up your own music server with navidrome, and combine that with the android app Symfonium (what i currently do). If you don’t like the idea of always streaming your music, for example if you have bad internet service outside your home, you can temporarily or permanently cache music to your phone.