Personally if I was the supreme ruler of the Earth, I would transplant ideologies and religions around the world to expand capacities of people as well as introduce them to nonreligious ways of thinking as well.
I would create puppet rulers to rule certain regions of land for example like someone to "rule" the Indian Subcontinent who answers to me and to me only.
I would disperse genes around the world to increase genetic diversity like genes for blonde and red hair. I would also fence off huge sloths of land for nature and nature only with little to no human interference.
What would you do if you ruled the Earth?