Have you tried fasting? I have found it an effective antidepressant and stimulant. There are also some interesting health benefits (mostly to do with autophagy, cellular and subcellular cleanup mechanisms).
But yeah, I am also ill suited to modern life, and I'm working towards being able to spend as much time in the woods as I need.
I haven't actually tried fasting. The longest I've gone without eating is something like 20 hours.
I should give fasting a try though, I believe in the research. My hesitation has been that I am pretty low BMI. I seem to struggle to keep weight on even if I'm eating a normal amount.
I did try going completely carb free for a week one time. I had no energy crashes which was great, but, I never really felt dramatically different mentally. While I wasn't crashing, I also wasn't suddenly feeling much more focus or "energy" (motivation, interest in work).
I was just kind of, stable low energy / motivation. Rather than, mostly low energy / motivation with some occasional really deep crashes caused by carb blasts.