I have been through the same. No burnout in startups, then a period of boreout in a large company, then a political manager, then depression, and then resigning

I have been through the same. No burnout in startups, then a period of boreout in a large company, then a political manager, then depression, and then resigning. Although my company did retain me in the end. There's nothing worse than a clueless political manager.