In my opinion, they need gradual, transparent offramps that are trivially easy to start using.

In an ideal world, this would look something like a single, zero-setup personal server + self-hosted client UIs that they use to interact with various platforms. A normie would start off with their usual mainstream bullshit centralized services ("post this update to X+instgram+facebook") in an aggregated feed. Gradually as more of thier contacts start using decentralized services they add these to their single aggregated experience. Eventually as centralized experiences get more and more hostile and the noise/signal ratio increases, the normie user can "turn off X/Facebook integration" (or just let them languish and filter it out of their aggregation) and seamlessly transition to better alternatives with no loss of social graph, memes, or whatever else they're worried about losing.

I'm biased because this is what I'm building.