The idea of a motivational speaker is always a bit iffy for me because if you have the motivation to change, you don't need people to tell you what to do and if you don't really have the motivation then a motivational speaker can just make you feel good for a minute or two or even a day and then you go back to your own old habits doing nothing to achieve anything in life.
Yes there are people who are inspirational and motivate you to do good for example people like Imran Khan, people like Malcolm x, people like MLK.
Most of the time these so-called motivational speakers have done almost nothing before they became a motivational speaker, it is like a self-fulfilling prophecy where they want to be a motivational speaker so they become one while telling others that how to get motivated.