Do you want to keep creating that comic? Then do it. Don't worry about how popular it is. Make the things you want to make.
If we only made things because they were popular, nobody would ever make anything that meant anything. And if you're in webcomics for popularity, you're in the wrong game, honestly.
I have one main on-going series on Tapastic, one sketchcomic I post on Twitter/Tumblr in multi-page "episodes", and I've done a few oneshots, besides my freelance work.
It does help to focus a bit, and to try to not do ALL the things at once - but I tend to prioritise according to what I want to make, not based on how popular the thing is with other people.