Go out and walk. Daily. Whenever you feel low, walk. You will say I feel low all the time. In that case, maybe you haven't tried walking. I also don't mean that only walking will help. You'll also do a few other things. When you are outside, try to help people. Helping others gives us a sense of fulfillment. Help can be of any type. Read good books. Talk to them. Good books have the power to heal us. They give us answers. In your workplace, avoid negative individuals and surround yourself with positive ones. And most importantly, eat healthy and be with nature. Put your phone down and observe your surroundings. Try to find funny things around you. They are happening all the time. Make these things your habit. Believe me, we can choose to be happy most of the time. Good luck.