How to decide which career to choose?

I am having difficulty regarding which career to choose between two options. I am not being able to decide whether to go back to university and choose the career of a professor in a few years’ time OR, start writing about self-help and do Youtube videos about self-help as a career. I am torn between the two options. I don’t know which career to choose. I want to choose a career I will enjoy more but don’t know which career I will enjoy more. How do I make a good decision here?