My work actually does energize me; the problem is that I tend to overspend my energy budget, so, on net, most things end up an energy sink. That was fine(?) 20 years ago but just not sustainable anymore.
For me, I stopped being rigid. That takes courage to get out of a comfort zone. Try something totally oblique to what you’re used to doing. Recognize your strengths and build on top of them. (For me one of my strengths is curation and organizing information). You can only build on strength. Hope this helps.
It’s funny, I had the same realization about running a business like 5 years ago: If you’re too rigid, everything becomes a Big Deal and needs addressing and there goes all your energy. Hadn’t made the connection to my current situation, so thank you for that.