You could try Funkwhale it's pretty much federated music https://www.funkwhale.audio/
Nice! Wasn't aware of this. Thanks for sharing
Used to use Soundcloud, but it's not quite what it used to be (also Reddit, but y'know). My most interesting reactions were on the ardour forums, though that's a bit specific to your DAW and IDK how that would be going in other DAW forums.
Haven't put out new music in a pretty long while, so I'm not quite up to date on things in the fediverse on this topic.
As an alternative you could try Discord. A lot of artists and labels have a channel for submissions / sharing.
Need a tip or want to show off your latest music production?
It’s here. Free software will be preferred but all are welcome. Don’t just post links without explanations, we expect you to comment your post or it will be moderated. If you ask something, be as precise as possible, provide context. And now, let’s talk audio!