Contrary to most advice, sometimes backing up and accepting a "failure" goes better for you in the long run. I've worked on about 10 or so comics. Only one of which (my most recent one) is something I'm actually proud of. I can still look back on my other works fondly but I'm able to pin point bad plots, terrible writing, and just not good art.
But with each failure I learned a lesson, and then stood back up and kept working. I would look back and see what I didn't like about whatever I worked on. Bad story? Started looking at story telling! Bad art? Started working on proportions, sketching, art tricks, practicing everyday and just putting in the time to get better!
Anyone can get better, everyone can improve. So maybe just take a step back and look at what you're making. See where it's "lacking" and try to fix it up! If you don't wanna give up on what you're making now, the greatest thing about Webcomics is that they're technically not permanent. You can always rework a page, fix an arm, anything. So keep on chugging and learning. As you grow as an artist and a writer it'll be a literal trail of learning! Enjoy the progress and the experience! Never give up on trying! But never be afraid to try somewhere else.
Keep on rockin' on!