There are tons of things you can do that don't make much a difference now, but help in the long run.
There was a minecraft summer building contest at my middle school a couple years back, and I participated in it. I won a gift card, and many people asked where I built it. I told them on meepcraft, and sure enough a couple kids from my school came, maybe 10 to 15.
That many players didn't really make much of an impact, but it got meepcraft's name out there. Even in the smallest of ways, you can advertise meepcraft in your community. Not telling anyone to make a billion posters around their town, but there are still many younger kids who play. If you're spending the holidays with your cousins and they play minecraft, tell them to join meepcraft. They might stay, they might not, but at least you can do something, no matter the scale.