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Several years ago, I got over my burnout by changing my work environment. I left a demanding job with equally demanding coworkers for a job which I was slightly overqualified for with coworkers who appreciated me and what I do. Completing simple tasks that I could do quickly resulted in positive reinforcement which reconditioned my brain to associate work with positive outcomes. Getting things done felt good again.

There's a lot of different kinds of burnout, so this might not apply to every case, but going through this episode taught me the value of positive reinforcement.