In order to get more people on Fedi, we have to get more people on Fedi. People will go whereever everybody else already is. That's the only thing keeping Twitter alive, even though almost everyone there will openly admit they hate it, no one will actually leave Twitter because everyone else is still on Twitter.
It's a chicken-and-egg problem that I don't think Fedi can actively do anything to solve. Or rather, I think it's too late to solve. If there's any competitor that has a chance, BlueSky has established a much bigger userbase in far less time, and that's enough momentum to potentially get there. Anyone who's leaving Twitter will go to BlueSky before they ever look at Fedi.