Maybe someone here already said this but if you find a community with not a lot of traffic here, make sure to post in it. Others might go looking for it and find nothing, just like you did. Perpetual cycle of I see nothing, I leave. If someone’s active, maybe someone else will be active with you. And then two turns to four to 8 and so on. Even if it feels like you’re screaming into the void, keep screaming. The void is infinite and someone’s bound to hear you eventually.
Owncast is streaming only, PeerTube has streaming as a feature. If you’re only looking to stream, run Owncast. It’s lighter on resource usage, easier to set up, fewer moving parts. If you want video hosting with maybe streaming as a bonus, you want PeerTube.