Experimentation may hold the key to mood management. One problem is that when you are down you don't feel like it and when you are up is doesn't seem necessary.
When one considers the areas ripe for experimentation it seems that something might prove helpful.
1. People, It might be that just being around certain people can have an effect on how you feel.
2. Nutrition. One can experiment to see if vitamins, supplements, or foods can have an effect on mood.
3. Exercise. The time, time, or duration of exercise might have a mood effect.
4. Prayer/meditation. As a Christian I find prayer effective, however, forty years ago I tried meditation, but I just kept falling asleep.
Experimentation allows one to discover things that might have some effect and slowly over time add them to a mood management "tool" box.