Not sure if you mean finding more music or having people find music you create. If you intend for people to find your music you created on a private self hosted platform you obviously need to look elsewhere but if you want to find new music to listen to there are still options.

You can connect Tidal to your Plex and listen to any music on Tidal on Plex and get discovery/recommendations. You can also connect Plex to Last.fm and get recommendations that way. If you want to manually discover music you can use a site that does that like everynoise.com