Become useful to something larger than your mood.

Mood is a poor employer. It sets the agenda daily, changes without warning, and produces nothing durable. Being useful to something outside your mood gives the day a structure that does not depend on how you feel when you wake up, which turns out to be a considerable relief.

Commit to something that will need you regardless of your state. A person, a project, a responsibility. On the days you feel nothing, the commitment will carry you, and that is not a small thing.