I believe the core of all self-improvement is this: help other people.
If you want to be happier, make other people happy. If you want to be wealthier, help other people succeed. If you want to be esteemed, help other people live better lives. If you want to be healthier, work with others on healthy goals.
Methods may change, but that’s all I’ve figured out so far in four decades on this planet.
The Opportunity Machine 