Qobuz or Tidal!
Qobuz if you know exactly what you want to listen to and playlists and personalization aren't the most important feature in a music app for you. If you subscribe to the Sublime tier you also get steep discounts when buying albums and singles from their store.
Tidal if you want to retain the spotify-esque playlist personalization and recommendations.
I've personally tested both of these on graphene and had zero issues with either of them.
Bandcamp is another pro-artist option but I never got around to trying it on graphene