I am not sure if you are singling me out becuase of alien.top or not, because alien.top (by which I guess you mean the whole fediverser project) is less about "asking" them to move and more about getting those who are already aware of th fediverse and making it easier to migrate?
However, if you are talking about me personally, I have indeed sent messages to people (not in mass, personalized) and I can no doubt say it is effective as a way to bring awareness.
A large number of reddit users who joined the mass exodus 6 months ago are probably back on reddit now and only a few actually stayed.
Yeah, for a lack of content in the niche communities. How would that be the fault of the people who are trying to promote the Fediverse?