I find that the best thing to do is to reassociate labor and effort with reward by doing lots of low-risk primary reward work after a high risk, high effort push (doing refactorings, code cleanup, etc), and that resting after high burnout risk made recurrence more likely due to rewarding not laboring; I haven't burned out at my primary job as a result (can't say I haven't periodically burned out in other pursuits like dating lol) in several years.