I kinda feel like there's a lot of circumstance at work here, so I'm a bit confused.
What exactly are you frustrated with? And why do you need to get better? What's your intent or goal here? Cause once you know the end game you can plan and make the appropriate changes to get there. Though it might be the case where you have to make some sacrifices to get there (especially if time is the biggest issue).
Honestly, I don't think its "talent" or the like, and that kind of thinking is probably preventing you from believing in yourself and building up confidence. Like you're stuck in some trap and the more you struggle the more you're making it worse for yourself. You need to create a more optimistic mindset for yourself, if for any reason because it will help you work better. A combination of stress, worries, anxieties, pessimism, etc. don't really make for good decision making and can often lead to you digging yourself into a deeper hole.
As for the genre, yeah tapas might not be the best platform, but I don't think its that niche really. Probably there's some changes you can make to the story and the art, but I think there's potential for a growing audience. Especially if you added more fluff and lewd stuff. Not everyone has to like your comic, but obviously you do have an audience.
I'm all for the "git gud" approach don't get me wrong, but that alone is too forceful. Yes, improve the art and writing, but also try to have a strategy and know where you can work smarter not harder.