Of course, it's everyone's own decision what they do with their free time and it is not my place to judge anyone, but you could at least give a good idea a chance, right?
But THEN, if after all that, they either choose not to read any of it, or do and then leave, I wouldn’t worry about it - bc you did your due diligence, so what more could you possibly do? And if you think of something, then yeah do that, but beyond that, it really is up to them to be willing to try new things.
The posts promoting Lemmy/Piefed only stay on /r/RedditAlternatives for so long. If at some point in time someone is looking for an alternative, goes to the sub, and sees nothing except 1-person project that will shut down in a month, then they can't find us, and we can't fault them for that.