Well number one is get on Nostr and use that as the primary "platform" instead of other social media. Build out a relay for private community and put energy/capital into nostr-based solutions like creatr or nostr.build.
I guess in terms of building from scratch you would need to diversify your video platforms. My personal preferences would be:
Rumble
Nostr Alternatives
YouTube
There seem to be a few nostr-based video services and I would focus on building out a presence there as they become more robust.
Rumble because it's not YouTube and there seems to be a lot of tips of content missing due to the prevalence of political creators. Open market basically.
Youtube as tertiary backup.
Not really sure how one might try to migrate an audience from legacy social media.