We have all been told that recording and evaluating your presentations is a powerful tool. I contend that having a mentor is more instructive and ultimately more beneficial.
A mentor will develop a relationship with you and get to know your style, habits and idiosyncrasies. They will know whether you are speaking from the heart or just play acting. A mentor will make suggestions that fits in with your style and speaking manner. Your mentor will push you to become better and better.
How do I find a mentor? One key factor is find someone who is better than you are. This person will be able to give you very detailed instructions. You may even have several mentors. One to work with your content. Another to help develop your style. You may have to work with several to find the right fit. Have patience!
A mentor maybe the best tool you will develop!