Many presenters tend to give too much information about their topic during a presentation, or at least more than their audience wants to hear. One way to narrow down your subject is to stop talking “about” something, which tends to invite every possible piece of information, and finish this sentence:
“At the end of my presentation, I want my audience to…”
Usually there is a specific call to action (recommend, approve, go out and buy), which requires less technical evidence and a clear recommendation. After all, can anybody but a subject matter expert know everything about a topic?