Why, this was quite a shock to read. I really don't know what to say since it looks like you made up your mind and perhaps anything I say may not be effective, but at the same time I wish to give you my thoughts because I'm going through a similar phase and the fact you made this public, you are probably looking for opinions or maybe even reaching out for some kind of help. I may not be the best person to talk about this, but I'll give it a shot.
I've been drawing for 15 years and I too feel I have not improved. I don't like my artwork and I really want to quit. I just feel jaded over everything I've been through as I've been trying to "make it" since 2012 and I'm still nowhere near what one would call successful. Heck, I was even working on a game with an artist as her coder, as I prefer to code over draw (the only reason why I draw in the first place was because I had no choice as I have no artist to call upon). It was a great time until she decided that she got fed up with the game after her previous team deserted her, so the game was canceled. I felt really bummed out about that because I felt, for the first time, I was a part of something. Add to that, I have been an introvert all my life and it's really messed me up (gonna try to be more social next year, Lord help me), I currently live in a very awful apartment and neighborhood (guy beat me up for my cheap $200 bike, that kind of neighborhood) along with the current situation of quarantine forcing me to be stuck in this apartment I despise because I couldn't go to work in 2 months, and the fact that we're celebrating Pride Month but my sexuality does not conform to that celebration, or society's acceptance as a whole, making me feel like a pariah, life really is a real struggle for me.
Yet still, even though I'm trudging along, trying to put up with all this emotional baggage, I still continue on. I'm a content creator, maybe not a good one and have yet to make it big somehow, but creating is something I really love. Games, comics, novels, any medium I can express myself in, I want in. If I just up and quit, what would I do? I would just be miserable. In fact, I'd argue that my comic is being made as a form of therapy. As much as I want other people to read it, I am making it to make myself feel better. The art is not good and in fact, compared to your art, mine is so amateur that I really don't like it at all. Still, I keep going and going because it's something I love, it's the only way I can express my anguish, my desires, and anything I can't do in real life. In other words, I feel like the things I do has a purpose and that's what keeps me going, even if I feel I am inadequate enough to do it better than anyone else.
What I'm trying to say is that we all suffer from time to time. I don't know who you are personally and I can only go by your comic. The other comic was deleted and I'm assuming the other collaborator either agreed to it or reluctantly deleted the comic, but if your comic is any indication about the art of the other, I really hope that this has to do with the collaboration effort in some way rather than your art in general because your art is very good, much better than mine for certain. I really hate to see you so miserable when you are clearly very talented. Perhaps my words, my story, and my poor attempt at a lesson may not make you feel better, but please don't convince yourself that you really are as bad as you think you are. I think the stress is just getting to you at this point and simply taking a break will clear your head enough to think things through. Resting may not fix everything, but I feel right now you are not thinking straight and may end up making a decision you will regret later on. So please, do yourself a favor, just relax, stay out of Tapas and your artwork, and just clear your head before you make any more rash decisions.
