I have spent a lot of time learning more and more about people. This is a nice visual reminder.
A word of advice be careful how you use point number 2 and number 5.
One point that wasn’t mentioned. When speaking to an audience you should speak directly to one person and look them in the eyes. Then move to another person and cover the entire room from left to right and up and down.
This should make it easier for you and more enjoyable for them. The only word of caution is that some people may find your gaze unnerving so adjust accordingly.