David spent two seasons performing at the Oregon Shakespeare Festival, as did William Hurt, Jean Smart, Kyle MacLachlan and Powers Boothe. At the end of each night's show, the actors discussed their performances. They kept each other from falling into the trap of library acting, or delivering a role with technical proficiency, but without passion or their unique perspective. Amateurs only have the skill to do library acting, but pros make the role their own.
Follow this model when you speak publicly. The entry level for presenting anything is to be organized and prepared. Do more than go through the motions. Raise the bar. Add examples and insights that allow audiences to imagine what you are delivering in a new, unexpected way. Don't be satisfied with being merely proficient, or your audience will search for your subject matter on YouTube or Google.