I might be a little brutally honest/blunt here, but please know that I mean absolutely no ill intent. I just want to give you some honest tips and critique to help you out. <3
(Also, apologies if I'm repeating what's already been said by others, I looked through the other posts but I'm probably going to be a little repetitive anyways :') )
I just kind of want to come right out and say it: you're only going to keep burning out if you copy whatever's popular. I've noticed your style change constantly over time, and it always appears to be in light of whatever artistic element is popular on WP. Yes, I do know that style develops by utilizing and combining artistic elements that inspire you (that's how my style came about, anyways), but there's a difference between developing style and hopping on the bandwagon. I'm not saying that your art style isn't unique, I can always tell when a piece is made by you, but sometimes it just feels... uninspired?? Again, I'm not trying to be offensive, it's just how I view these things. Just... draw in a way that makes you happy, not because it's popular. Otherwise, you'll just get burnt out.
To show you an example of what I mean, this is one of my favorite pieces that you've made (I had to dig a bit through your gallery to find it, haha)
https://i.postimg.cc/vH136NMx/1537466232460.png
I dunno, it just looks so... Cun, and I like that. I honestly think you should consider drawing in this kind of style more (as long as it motivates you and keeps you happy of course, haha)
With all that being said, the next thing I wanted to say that might improve your art is to focus a bit more on anatomy. I've sure you've heard this saying before, but try to learn the rules before you break them. That meaning, maybe take some time to study real life canine anatomy, particularly how things like bones, joints, and muzzles work, before stylization. This can be done totally in your free time (one trick I occasionally do to practice this is to take a photo and sketch out the rough anatomy over it, and then redraw those same anatomy lines off to the side without the image underneath. And then from there, build up the sketch until you've got something ^^) Once you've got a good handle on the anatomy stuff, feel free to play around with proportions and whatnot to get a style that you're happy with. I really do feel like your art suffers from some major anatomy problems, especially with the joints in the legs being off, the eyes being too close together, and the muzzle often being at an odd angle. Taking some time to study anatomy will really go a long way. And if you need any help with this, feel free to PM me! ^^
One last note I wanted to make about shading: the painted style just doesn't really jive well with me. If you want to do more painted shading, then go for it, but there are some things you can do to improve in that department. For one, I rarely ever shade in black/greyscale, it just muddies down the image in my opinion. Try to shade with colors that match with the mood of the image (use warm colors to portray a sunny day, for example) or that compliment the character. In addition, the way you do your shading right now doesn't make your characters look like fur, in my opinion. I believe someone else said it looks more like they have a wood texture overtop of them, and I kind of agree with that. I'm still working on how I portray fur myself, so I wish I could help you out more here, but all I can really say is that more smudging does not really equal more three-dimensional. Try to focus on light vs dark areas, and then adding detail from there, instead of focusing on detail in general.
(this can be applied to backgrounds as well! Grass and trees do not have to be a flat green, try to play with color a bit more!)
(I also think you should do more cell shading, like I mentioned above. I dunno, I just think it suits your style well. But that's just my opinion, like I said, do whatever you feel like doing ^^)
I'm so sorry for this longass post, and I really hope I'm not coming off as too blunt. I really want to see you improve, and these are just the things your should work on. You've got a lot of potential, and I can't wait to see what you do in the future. ^^