How may I take my fitness career much further?

I want to become a personal trainer and help people, but the thing with me is that I just don't want to become any regular type of personal trainer I want to be professional in this fitness industry. So, I decided that I want a PhD in something that has to do with fitness and nutrition but I don't know yet.

Can anybody give me any advice?
How may I take my fitness career much further?
Post Opinion