If I was in your shoes right now, my #1 focus wouldn't be trying to chase down new places to distribute your videos, but rather to leverage your current YouTube audience by advertising your Nostr to funnel them here, establishing this as your impenetrable homebase. That way, if the ban hammer does drop on YouTube, your audience will all be here so you can tell them where you'd move to next.
You want to have that ground zero of communication with your audience that doesn't rely on ANY of those video platforms, no matter how much they preach their censorship resistance.
This is why I'm 1000% focused on Nostr and just posting my videos on YouTube still. YT gathers the most eyeballs, send them all to Nostr where you're safe from algorithms, and you've got the best of both worlds, prepared for any steps after that!
How would I do that exactly? Post my public key and a link to @primal app?
This is what I've done, and it's worked well for me:
1) Make a dedicated "Nostr 101" video that's tailor-made for your audience. It should walk through what Nostr is, why your audience should care about it, and how they can make an account and follow you
Here's mine I did with @Derek Ross: https://youtu.be/_jrkUXDReqI
2) In all future videos that you want to funnel your subscribers to Nostr (I do it in as many as I can), just give a very brief "follow me on Nostr" in the video, and tell them that to learn more, "go watch that 'Nostr 101' video linked in the description", and plunk your npub right under it