Vary the loudness of your voice. Alter your rate of speech - a change of pace works wonders to catch listeners' ears. The third Key to Great Speechmaking is Feedback. Too many speakers neglect this important step. You cannot afford to be one of them if you want to succeed in front of influential audiences.
Winners assess and learn from feedback in any number of ways.
There are formal methods, such as evaluation forms. And there are informal techniques, like calling your host to ask how you did. Of course, the truest measure you have hit a Mark McGwire-like home run occurs when you are asked to return and speak again next year. So, you see, there is no reason to fear having the spotlight shine on you when you speak in public. You can succeed if you take advantage of Barks Communications' Three Keys to Great Speechmaking - Preparation, Presentation, and Feedback.