There have been some good ideas posted here ... thanks to everyone.

Behaving in a way that I feel good about helps my self-esteem. There is a saying in psychology that "feelings follow behavior". So, living my life in a way that I feel good about helps me feel better. Examples - doing my best at work, keeping my commitments, showing kindness toward others and myself, being supportive of friends and family, taking care of my body and health, forgiving myself when I fall short of where I would like to be - all of these (and more) help me feel good about me.