Learn what drains you the way you learned what drains your phone battery. Then close those apps.

You already know exactly which things flatten your phone by lunchtime, because you noticed a pattern once and kept it. Your own energy runs on patterns just as reliable, and almost nobody tracks them, so the same draining afternoon repeats weekly with fresh surprise at the exhaustion. Some drains are necessary and stay. Others you have simply never looked at.

Write down what you did on the three most tired evenings of the past fortnight and look for the repeat. Remove or shorten one of them this week, then see what comes back.