Protect your best mental hours from low-value decisions.

You have a limited number of hours when your thinking is at its sharpest, and they are easily consumed by trivial decisions and small administration. Spending them there means the work that needed your best mind gets whatever is left. The loss is invisible because the small tasks did get done.

Identify your best hours and defend them for one substantial thing. Push email, errands, and minor decisions to the periods when you are duller anyway. Matching the task to the capacity is one of the cheapest improvements available.