Keep your audience engaged

Use emphasis.
Make contrasts and comparisons between words to highlight points to your audience. Also, add some force to your tone to emphasize important words and phrases.

Change your pitch.
Avoid sounding monotonous. Accompany every change in thought with a change in your voice pitch. This will make you sound more conversational.

Pace yourself.
Speed up and slow down the tempo of your speech as needed. Avoid talking too fast or too slow.

Pause for effect.
Pause either before or after, or both before and after, an important word or phrase. Pausing before helps you to build suspense with your listeners as they anticipate what you’re about to say, while pausing after an important idea gives it time to penetrate.

Arouse emotion.
The most memorable speeches are the emotionally-charged ones, so evoke the emotions of love, sympathy, sadness, etc. Get your audience not only to think about what you’re saying but to feel it too.