There is a high-level list of subjects in Mi Yodeya's scope on the "What topics can I ask about here?" page of our Help Center:
Jewish law or practice (what to do or why)
a Jewish text (explaining a passage)
history of Judaism
language used in Judaism
general knowledge (science, etc.) as it relates directly to Judaism
Only the ...
I don't advise gaming the vote system for that purpose. Votes are supposed to be based on content, not to reward (or punish or give chat access to) the content's author.
If I'm not mistaken, a Mi Yodeya moderator can, if needed, grant explicit access to someone with too-low rep to chat in a specific room.
My general intention behind this contest was to test the waters a little bit and see what the community is up to. It is as I had suspected, currently people seem to be less active, especially as regards a contest as compared to previous events. I include myself in that camp. I imagine things will pick up again.
Moving forward, here's an idea for a contest ...