Has anyone improved their energy levels dramatically over the years?

Hi one of the biggest hinders I have felt that prevents me from success is a lack of energy. I have done everything else. I take adequate amounts of sleep, eat good food, hit the gym,etc. But nothing has improved that much. So now my plan is to take up running and do some Wim Hoff style breathing exercises to see if that would improve the situation. What have been your experiences?