The ideal platform is Funkwhale, in my opinion. It is a part of the fediverse. Peertube is also a good option. Apart from it, you can find an aggregator, who can post your music on many platforms, some options are LANDR, CDBaby etc. But they charge some fees. I have published my music using Symphonic Distribution. I have registered as a record label there and have published music by many artists. Some aggregators also do that content ID thing on YouTube.