The forum in particular, or the site as a whole? I think the site has some exciting stuff in the pipeline already. As for the forum, all I can think is what I just said. Start new threads! Some of the threads are very...what's the word I'm looking for...not 'cultish'. But exclusive? Like everyone who's been here for ages is chatting for 10s of pages about whatever and a newbie might not have much of an entry point into that sort of thread (which tend to be the more active threads). Also, perhaps post more about comedy? That might help.
Why are we after Millenials anyhow? The millennials born in the late 90s early 00s probably have never been on a forum in their lives, at least not one that isn't reddit or somesuch.