What I found what really helped me was turning that jealousy into admiration and support.
Always a fan of Sakimi-chan and Meago (the artist who does that art where she turns food into cute girls), I started supporting both of them - I support Sakimi-chan on Patreon (although I do it mostly for the art, still not a big fan of her as a person), and I pre-ordered and purchased Meago's first edition of her food girls as an art book.
And any artists that are on Tapastic that I admire or really want to strive for, I support them on Tapastic. It really helps potential jealousy turn into admiration and caring when you feel like you're doing your part to help them further their career, and with all those connections, you have something to fall back on too.
I'm not saying you should be throwing your money at people to get them to like you or to get over your feelings regarding their art. All I'm saying is, you should try and channel those envious feelings into more positive reinforcement, and maybe learn a thing or two along the way. I've found and gotten a lot of tutorials from said artists as well, and I've attended livestreams, and all of this I feel has helped me improve a little bit more each time.
So even if it's just leaving friendly comments, engaging in their fanbase, doing fanart, or whatever it is you want to do, in order to feel the way you want to feel about their art, you have to start acting the way you'd want to feel to change that. If you continuously act jealous, it's only going to get worse and that jealousy is going to turn to hatred and spite. Be the change you want to see in your own opinions and emotions, and remember that every artist follows their own path. Everyone struggles at some point, even the best artists in the world. We're all still learning, and no matter how good you get at your art, there's always going to be someone who's one step ahead of you, so keep striving for that person and grow more and more as you meet more people, get exposed to more art, and learn more things about your own style and art.