Peertube is a video and streming platform (like youtube) and owncast a streaming platform (like twitch) that are FOSS, self-hostable and connected to the Fediverse. Although I don't think getting any amount of viewers on those platforms will be any easier.
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There is peertube, and for twitch I mean owncast exists... Odysee is also highly recommended.
Odysee is also highly recommended.
https://gnet-research.org/2021/02/17/odysee-the-new-youtube-for-the-far-right/
There's PeerTube, and there's also LBRY.
Honestly, if you're someone making gaming videos, it's hard to find an audience in other platforms.
There is also GNU Media Goblin that the FSF commonly uses. Federating it is on the roadmap but I'm no sure it has happened yet. I think it is possible to get their casting apps too but I have not tried.
If you're looking for peertube instances to check out, I suggest TILvids and diode.zone. You can also search for videos, channels and playlists across every instance through Sepia Search.