There's a specific moment in the development of a persuasive presentation when you pivot from the preparation of the talk-track and imagery to the practice of your delivery.
This is the exact moment to implement the 20-20-20 rule: Less / Slower / Louder.
Cut the bottom 20% of your content.
Even if you believe your talk-track and imagery is all essential, get rid of the bottom 20% of your images and words. Don't give the audience an opportunity to focus on the least important parts. Remember the famous words of Mark Twain, "If I had more time, I'd have written a shorter letter."
Take some points out entirely, or trim some stories. Your audience will retain more of of the most important points.
Speak 20% slower.
You just cut 20% of your material. Now slow down 20%. Your presentation will take the exact same amount of time. This also helps you stay focused throughout your delivery.
We all tend to speed up when presenting simply because we get our adrenaline flowing. That's natural. Simply counter that by intentionally speaking 20% slower.
Speak 20% louder.
If you're in a small meeting or conference room, please don't crank up your volume. But if you're in a boardroom, or in front of a large gathering, increase your volume 20%. Speaking louder often improves your diction and clarity as well.
The audience must be able literally to hear your words, before they can understand, agree, and advocate for your point-of-view.
Say less. Slow your pace. Command the room. Increase your executive presence.
Implement the 20-20-20 rule, and you'll be more likely to hear, "Yes, I agree with you."