Based on a reply on the Fediverse, I've gone with https://funkwhale.mastodon.host which allows uploads of up to 1GB per user.
@jcbrand unfortunately I haven't come across a funkwhale instance that allows uploads yet.
For listening I'm using open.audio so far.
Too bad, I guess I'll stick with Soundcloud for now then.
Generalistic and moderated instance. All opinions are welcome, but hate speeches are prohibited. Users who don't respect rules will be silenced or suspended, depending on the violation severity.