would you want to adapt your style, or keep it more as is? i recommend https://www.pixilart.com/ for more pixelated art (it's also free!)
i'm also going to second other people's suggestions of Clip Studio Paint (an absolutely fantastic program, bit of a learning curve due to the layout) or Medibang. Clip Studio Paint is on sale very often, so if you're thinking about gettting it, maybe bookmark the website and check back on it to see if it's on sale about every month or so.
since i saw someone recommend Inkscape, Illustrator is also a really good program that's very similar . . . . VERY pricey though. never used Inkscape but i will say, if you have the chance to learn how to do vector art, it's a hard learning curve but it's really worth it.