I also feel this a lot of the time. I basically gave up my gamedev hobby completely for comics, and although I still feel the urge to make a game every once and a while I recognize that I'm WAY worse at gamedev, and I like the real version of making comics, as opposed to the idealized version of gamedev. Anyways, this isn't about that.
I made my first comic a few months ago, and it took me about a year to finish the whole thing. My friends and one or two people enjoyed it, which I cherish, and then it completely dropped off the face of the earth. That's expected.
The moral of the story isn't that I should've just made something popular, divested most of my time into marketing, or that I shouldn't have made a comic if it was going to take that long. The moral of the story is, even knowing this, I would never want to have that time back. I had made something that was mine, something that I wanted to make for a very long time, and I finally got to going and made it, and now the story is out in the world and isn't just thoughts inside my head. My art improved, my writing improved, and I had fun making it.
So maybe making comics is a waste of time, and maybe people don't like your genre/story, but so what? You made something, and you're bringing your ideas to something physical. That's a lot better than a lot of people can say. I believe that comics are a really fast way to improve, because you're making tons of little drawings of unique situations and figures. When I started, I had no idea how to draw pigs and other animals. ..I still kind of don't, but I'm way better than when I started, and if it wasn't for this comic I would've never even attempted to draw anything other than humans. No matter how bad you think your story is, or how your art looks to your eyes, you're trying something, which means it's fruitful.
I have some advice for the feeling you're currently having, and I think your burnout hunch may be correct. Taking breaks is really good for dealing with that, and even big authors take breaks sometimes. I wish you all the best on your comic journey