What helped me a lot was to regulate my caffeine intake. I consumed way to much, that it wasn’t helping me with my energy levels. Caffeine also takes about 8h until its gone from the body. So it effects your sleep quality as well. Now I usually drink one decaf coffee in the morning (decaf has only about 20% caffeine from normal coffee). When I need to focus on important tasks (like no meeting days or private projects) I drink a coffee and it helps me a lot.