I understand you completely.
I started as a pixel artist, doing free orders for practice. I got to a point where I had so much to do that it was physically tiring to actually get on my laptop and draw stuff.
I simply let go of those orders and started doing my own thing for a while until I felt ready to draw for others again.
Though, I think what helped me most was changing. I stopped doing pixel art work and started painting and sketching other stuff, and nowadays I try a bit of everything. I rarely get artblocked now, because I can do pixels one day, and paintings the other so I won't be doing the same thing all the time.
Maybe it'd help you to change and vary your stuff, experiment you know? Try different chibis, or drawings, try new techniques. Draw for yourself, because the only way you'll enjoy and evolve as an artist is by exploring new stuff. Doing orders and selling is just a bonus. Just like every other job, you'll be much happier if you're doing what you like to do.