Two things you can do instantly to become a better public speaker than everyone around you:
1. Do not say anything if you have nothing to say. If you can’t find a word, you have to train yourself not to fill the silence. Just make no noise until you’re ready to speak again.
2. Stop that thing everyone learned where you outline your points on index cards, because that means you have to connect the points together on the fly. Either write out full sentences or riff off your slides.