Ego is the number-one enemy of effective public speaking. That's because it stands between speakers and audiences. Those in the latter know that they aren't welcome into the speakers' mind and heart. The show is entirely the speakers'. And, you bet, they in the audience resent it.
Along the way bigbrain Hillary Clinton figured out a way to address audiences in a way that communicated two things. One is her expertise and confidence about about it. The other is respect for what they may be thinking and feeling. How she frames her tone and content demonstrates that she had researched her audience and has included their points of view and concerns.
How can public speakers welcome in audiences?
Research. Make that highly specific. If the group is based in Troy, Michigan, talk to those who will be attending. Read between the lines. Ask explicitly what they need to hear.
Forget yourselves. Being in the zone or the moment is not just for athletes. Public speakers have to be present with the audience. They can't be off mentally and emotionally observing themselves. Audiences pick right up when speakers aren't with them.
Have audience participation. That can be as simple as recognizing individuals or groups in the audience. Or it can involve more risk such as randomly calling on people and asking what keeps them up at night. There can't be plants in the audience.
Share personal data. The older the speaker the more tendency there is to keep facts of one's life private. However, in this era of wide-open social media, the expectation is sharing. The best details are those which aren't widely known.
In a short story about New York by Truman Capote the narrator defines growing up as the epiphany that not everyone loves us. For public speakers that realization should be embedded. Their objective has to be to pull all members of the audience, especially those who don't love them, into a magic circle of common humanity.