Ah, I get it.
It's a balance of knowing why you do it for yourself and why you do it for others. You have to have a reason for both. Sometimes creating a comic just because you like it does not feel enough, but creating something just for someone else makes you hollow in the end. It's tricky, but you have to find the balance of "this is fun to make" and "this is fun to read". Creating a comic is a longer process compared to coming up with a story (writers might fight me on this), because technically it's like doing the same thing over and over again (you have the page in your mind, you draw the same sketch, you ink the same page, you color/tone the same page, you letter the page going through the story again in your head), so the burnout is real.
If there is ever something I've learned over the years, it's to:
(1) Have a creator friend whom you can talk ideas with. Going through the same story over and over again in your mind can make you "blind". You wouldn't spot what's fun, what's weird or even offensive about your story, and it's not as exciting with only yourself. Having a "what do you think" before finishing the product is important for motivation, so you don't feel like you've done so much work for nothing.
(2) Appreciate your readers. Even if there is only 1 person, it's a comic worth making. Make it for that person. Comic is a medium; think about what you want to convey through your comics, like a very subtle long-winded letter, if you'd like. A stupid but kind character might be relatable to someone, and might make them feel less lonely reading it. Even something as simple as 4-panel comic strip can make a person smile if it's funny. That person might have had a bad day and that smile might be the first in their day. And that's the worth of that comic.
In terms of technicality, if your draft is really rough, accompany it with character designs and summary so people can imagine what's going on in the draft.
And if you can already see what's lacking from your comic on your own, pat yourself on the back! That means you are already improving, and it can only get better from there as long as you listen to yourself. But remember: finished is better than perfect.
In the end, don't be too hard on yourself. Not having a grand goal is fine. It's okay to just be an indie creator if you're happy with your full-time job. Not everybody needs to hate their full-time job just because they like comics. It's okay to keep this as your retirement plan, maybe. You don't have to aim for pro just because that's what everybody seems to be aiming for. Even those who are, would still have times when they doubt themselves.
You are not alone!
Hope you're feeling better!