Hey!
I checked out your comic and I honestly think it;'s a fun concept that'll be a good time to follow. I also think that it's only been up for five months, and that Tapas in general doesn't really make it easy to promote new stuff unless the artists have proved their concept with something else.
Also! If you've looked at the forum at all even really well established artists are having issues getting views under the site's current formatting, which I think is a big sign.
I would say just keep plugging along and doing what you're doing, and try to remind yourself that growth isn't always exponential! Believe me! I started posting my comic here in January, it's 65 pages and I only have 6 subscribers to show for it, so it's hard not to get down on it. But I'm gonna go ahead and guess that you started working on this story because it's one you wanted to tell and that you're having fun telling! In time we'll all build some kind of reader base, as long as we keep putting the effort in.