There is a part of God, the perfect one, in each of our soul.
Developing that part is what matter the most to me. It means improving myself towards perfection. Sounds too egocentric. However, my best self is the maximum contribution I can give to my family, organization, and the world.
If “I” change, the world will change. Thus, the world can be changed only by me, and no one else will change it for me. When a person improves, a small part of society also improves.