Find ways to perform small, random acts of kindness during your day. These acts can be incredibly simple, from complimenting a stranger at the grocery store on his or her shirt to making your spouse coffee before work to engaging a co-worker you don't usually talk with in a friendly Zoom chat. 

Deliberately performing random acts of kindness can make you feel happier and those acts you do for others has a longer-term effect on your own happiness. 

This works because these acts tap into your natural prosocial behavior, or the basic human impulse to help others, Simon-Thomas says. When you invest your own resources in the welfare of others, it activates your brain's reward system -- you feel good that you made the other person feel good. 

Writing down three things you're grateful for at the end of each day, and why they happened, leads to long term increases in happiness and decreases in depressive symptoms, according to a 2005 study from Martin Seligman, director of the Positive Psychology Center at the University of Pennsylv...