Sleep

been there, and eventually will be there again (but hopefully not) 1 - i talk to my fellow designer, and my mentors 2 - i take long walks. or if you have budget, take a vacation 3 - play video games, or do my hobbies 4 - i eat my favorite foods 5 - i dont look at behance or pinterest etc.. because when i am burned out, it doesnt gives me inspiration, but rather, pressure i stay away anything related to designing. and back when im okay

Gotta take some time out, only thing that works for me. Also, I've found that I'm better off taking the time off when I can feel a burnout coming, rather than letting it all build up...just got to be a bit more diligent with your workload