Ask HN: How to move from CTO to COO/CEO role

I am currently a CTO of a startup. My co founder is the CEO. I don't intend to be CEO at my current startup, I am happy and satisfied with my current role. I want to prepare myself to be a CEO or COO type of role in my future endeavors. I am an older candidate, introvert and a foreign national with an accent.

Here in my plan of action,

  Attend American Accent classes to neutralize the accent. 
  Possibly, attend top tier part time mba program.
  Improve networking skills