I know improving things is different from person to person. Yet, it's still improving one aspect or another of the world around you
The reason I said the meaning of life is to improve, is to make a way for a person to feel their life is meaningful. You could say your life is meaningful, but you should think what made it so. In the end you probably improved something, if you think hard enough
In order to dominate, you must improve your skills, military, or any other thing that you are using in domination. Your meaning would fall under mine.