Discord is kind of the secret weapon here if you want actual communities instead of just passive viewing. A ton of smaller streamers run their own Discord servers where they go live, and you're actually talking to people who care about the same niche stuff. You get way more interaction, smaller stream sizes, and the vibe is totally different from the usual Twitch algorithm trap.
Beyond that, platforms like Kick have been pulling streamers away from Twitch, and while it's still building out, the community there tends to feel less corporate. Rumble also hosts livestreams now. YouTube Live works too as others mentioned, though honestly it still has the same "lost in the crowd" problem if the channel isn't huge. The real move is finding niche Discord communities first - search for ones around your specific game or interest - and watching people stream from there. You'll actually recognize the same folks and build real connections instead of just being algorithm'd around.