[marginalia_nu]

Could be multiple factors. In my N=1 experience fiddling with various things in my life.

* Improving diet (primarily avoiding refined foods and sugar) generally improves my energy levels.

* Cutting out social media mostly improves concentration.

* Trying to avoid rumination such as problem solving or rehearsing arguments through meditative practices reduces stress levels, makes it easier to be present and react to things in front of you.

* Sleep is also pretty big for cognitive clarity. Having a consistent sleep schedule and not drinking coffee past noon helps with sleep.

But really, all of these seem to tie into each other. If you want to improve your diet, it's much harder if you are tired from lack of sleep or overstimulation. If you want to improve your sleep, you can't be scrolling social media all day. Mental exhaustion also makes awareness/meditation harder.