I think you have to just keep on practicing actually speaking, like even in front of a mirror, I didn't do this enough (I practiced, but in front of my machine). Also just look at a few people in the audience, think of it like you're chatting with 1 person 100 times/5 people 20 times as opposed to chatting 100 people.
- https://speaking.io/ - https://www.pluralsight.com/courses/hanselman-speaking -> Mr. Scott is really good, I like his talk: https://www.youtube.com/watch?v=FS1mnISoG7U.
I think you have to just keep on practicing actually speaking, like even in front of a mirror, I didn't do this enough (I practiced, but in front of my machine). Also just look at a few people in the audience, think of it like you're chatting with 1 person 100 times/5 people 20 times as opposed to chatting 100 people.