I know you counted this out, but diet has been by far the biggest factor for me. I started rigorously eating a keto diet, with almost all grass fed organic meat

I know you counted this out, but diet has been by far the biggest factor for me. I started rigorously eating a keto diet, with almost all grass fed organic meat/eggs and organic veggies. Very expensive if done properly, but I feel like a different person. The change is astounding, to the level that I am more articulate and am better at holding a conversation. It takes a few days of proper eating for the effect to take. I would give the keto diet a shot before anything else. I have found zero supplements and vitamins that have any long lasting effect.