There are two common assumptions about making pitches that are sure to get you in trouble. The first is to “just be yourself”. Trust me. Yourself isn’t that great. Effective speakers use business theatrics to help them add energy to their personality.
Second bad assumption. The audience will listen because what I have to say is important. Correction. It’s not what you have to say but how you say it that makes it important. Your audience will judge much of what you say by your body language.