Age teaches that energy is easier to waste than recover.

A late night, an unnecessary conflict, an hour of scrolling, a week of poor sleep: these are spent instantly and repaid slowly. The asymmetry is invisible while recovery is fast, which is why it takes years to notice. Once it becomes clear, the question of what deserves your energy stops being abstract and becomes practical arithmetic.

Look for the one recurring drain that costs you the most and is easiest to remove. Not the whole list, just one. Protecting energy is far more effective than trying to generate more of it, and the protection is mostly a matter of declining things.