This question is open ended because it depends on which angle you are looking at it from . From a Spiritual angle God is charge but the devil rules the systems of the world.
From a political angle, the president of the United States of America rules the world
From an economic angle China rules the world
From a financial angle Elon Musk and all the billionaires around the world rule the church
And we can go on and on, but God is the overall owner of the world. Psalms 24:1-2 NKJV
[1] The earth is the Lord’s, and all its fullness, The world and those who dwell therein. [2] For He has founded it upon the seas, And established it upon the waters.