Narrowing down a specific audience

How do I narrow down all the information and content to a mere mortal level of a segment of the population. I am interested in speaking to CEO’s for destressing and create clarity in their businesses, family, and personal life. I am also interested in helping teens and college kids/early 20’s to find their purpose, who they are, and created focus and purpose in their lives. I also want to create a talk for Churches/Christian organizations.

What is the best way to narrow this down?