How can I make a career in personality development?

Improve your communication skills in the first instance. Develop the techniques of a good presentation. Be patient and listen to people. Don't hurry through a presentation. Take your time. Develop awareness and a sense of humour. Be confident. Then, understand your material thoroughly.

To make a career in personality development you need to be creative, have practical knowledge, have a balanced mindset, most important have dedication towards your career, patience is most important.