I'm not sure if AvistaZ has music but you could check there. It's a private torrent tracker but unfortunately the registration isn't always up. You can join their Discord to be notified when registration is open. Alternatively you can pay for access by buying a seed box from them.
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
Correct me if I'm wrong, but it seems that as long as you don't buy processed foods in America you should be able to easily avoid Nestle?