For me, simply speaking, I exercise. Walking fir twenty minutes each day tooosen up and begin to energize. Also, I go to the gym and exercise under direction of a competent trainer three days per week. The exercise is demanding but I feel great and energized. Even my sciatic pain is reduced and many times mitigated. Regular and sufficient nightly sleep. I take naps but no more than twenty to thirty minutes; sometimes just laying down and just resting staying awake. (I suspect that your long naps are affecting your sense of energy.
By the way, I am 79 y/o almost 80. I ride horses and ride a mountain bike. All of those I enjoy and find very stimulating.
I wish you the best and success in trying daily walking and some light exercises. I truly hope this works for you. Peace be with you.