I haven’t seen your art before, but know this:
Art isn’t about being good enough. It sucks if you feel like you’re not as skilled as you should be, but if you really want to be good at art, you need to practice. Motivation can come from others liking your work and complimenting you but the reason behind your art comes from you and your desire to do art. If you don’t feel inspired, maybe you should take a break and try again in a couple of days, weeks, months, or however much time you need.
But like Zaddy said above, if you’re not doing art for your own enjoyment (and by that I mean even if you’re doing it for the likes but you still have fun doing it) art might not be for you, as it takes a long time to improve. Success is subjective, so I don’t know what you need to feel like your art is worthwhile, I just hope you take some of what I’ve said into consideration before quitting entirely.