I have a great passion for public speaking and can tell you there is a market. I have my own public speaking business for the past 6 years. You need to find something you are interested in and are good at. I would suggest joining a toastmasters group. That is a group that will help you develop your speaking skills. I have been a member of toastmasters for 9 years. I will be happy to talk more about this if you would like.