I'm actually not in charge of any Meta Wikis aside from Monobook Wiki (and Wordmark Creation Wiki which I never actually worked on). I actually only edited Template:MetaFooter to remove Monobook Wiki from there since it's been inactive for a while. Yuzura, Yatalu, and Thisismyrofl are the people you should contact about having your wiki added. I actually haven't edited around Wikia in a while and only came 'round today was to tighten some things up on Monobook Wiki.
I don't know if the three users I listed about are still active, but I would contact them about these things.