This is just my take on it of course but... Be active, and don't be (too much) of a jerk (pardon the direct expression). What I mean with that is basically: always keep in mind what this is all about... a game which is supposed to be fun, for everyone. So if you try to do things with your union and some people don't care... leave 'm be. Everyone should be able to enjoy in their own way.

But also keep a close eye out for active players, maybe even promote them to fuel their motivation a bit. That helps!

Most of all: be active and keep in mind that what might be fun for you doesn't have to be fun for others.