I agree with sundanceann, it sounds like maybe you bit off more than you can chew and before you jump into a series you should try doing a one-shot, or a series that's 200 pages or less all together. Something short.
Before I started my series FaLLEN I had completed around ten or so one-shots and learned from a bunch of my previous mistakes. Most of those one-shots I didn't even post online, since they were mostly for practice. In the industry, one-shots are considered harder to do but they say if you can do one-shots, you can do a series. Essentially, a chapter is a one-shot anyway, even if it's in an ongoing series. Each chapter needs a beginning, middle, and end of some kind (ie, character wants to make chocolate for her crush, makes a huge mess of her kitchen as mayhem ensues, ends up buying her crush chocolate only to find out he's allergic to chocolate in the end).
I would go ahead and announce you're canceling your series, since if you ever do decide to pick it up again you'll probably want to redo it from the beginning anyway. I hope you didn't have too many readers, because to be honest this kind of thing hurts your credibility as a webcomic artist. If you REALLY want to challenge yourself, put the story on hold for a month or so while you sit down and try to rework things. See if you can make it interesting, make it work, change it up, etc. But if you absolutely don't want to, if you want to move on, then I guess all you can do is suck it up and apologize to your readers. But think of your readers before you start a new project. Really work through your characters, your setting, your plot, etc and make sure it's something you can stick with before you begin anything else and make any announcements.
Whatever you choose to do, good luck!
Check out FaLLEN on Tapastic!