I have not been on Elliquiy for very long, so I am, by no means, an expert. I would look through the other wanted threads, especially the ones with lots of responses, and see if there are similarities that seem to draw a lot of attention.
In my short stay, I have seen D&D threads explode. Granted, those are usually posted in the group area. But that is the kind of thing to take notice of. What are other people looking for and see if you can find some common denominator with the masses.