Here's an interesting list of advice you might want to check out about growing a following here on Tapas:
I think pretty much everyone agrees that there is no trick to gaining a following. Some people get lucky and pull it off relatively quickly, but for most people it takes a lot of hard work... not just a snazzy profile pic.
And I have to agree with @AffectedMind on this one, creating a bunch of new topics per day that all link back to your comic is kind of spammy... which is frowned upon. We'd appreciate if you could participate in the forums by finding other people's posts that interest you and responding to those. There are a lot of users so there's usually a lot of convos going on for you to jump into. You can even use the search tool to find threads on things that interest you.