Hard outdoor physical labor where you are up before dawn, work flat out all day, and fall asleep exhausted shortly after dusk. Do this 7 days a week and you won't have time to be depressed.
I have personal experience of working this hard, but having never been depressed I have never had to use this approach. I have worked with people who have used it successfully and if I were to get depressed it is exactly what I would do.
It seems to be important that it is both hard physical labor and outdoors in the sun.
I do, and it works great! I normally work a desk job, alternating between the two is amazing. Working that hard every day of the year isn't sustainable, but physical labor in shorts bursts of a week or so can boost my mood for months.
One guy who got that advice from his brother went on to be the Forrest Gump of eggs in Indonesia and became a billionaire.
Raising animals has all that and you also have the emotional relationship of the animals to boot.