A good mindset won’t stop bad days. It just makes them shorter.

No way of thinking keeps a bad day from arriving. What changes is the recovery time: how long you sit in it, how much of tomorrow it takes down with it, whether one rough afternoon turns into a rough fortnight. Across a year that difference is not small.

When the next one lands, stop trying to feel better and aim to end it cleanly instead. Eat something, sleep, make no decisions after midnight. Tomorrow morning is a genuinely fresh attempt, and letting it be one is most of the skill.