If you really want to make a difference please try to make people to migrate to something open. Quicksy[^1], DeltaChat[^2], something. But not another, essentially closed platform.
I agree. However email metadata isn't secure, so that's a nonstarter. I'm rooting for Matrix but thusfar Riot's UX to get an encrypted conversation going leaves a lot to be desired. No way are the non-technical people I know going to be able to do that. Signal "just works" with secure defaults, so that's the best we've got for now.