How to Deliver a Powerful Talk

Speak from your heart instead of reading your speech. Keep eye contact with your audience – do not talk to your notes, slides, or whiteboard. Talk loud enough that people at the back can hear you. Be sincere and authentic. Be energetic, enthusiastic, relaxed, and smile.
Be gracious to have an opportunity to address the audience. Greet the audience and the organiser.
Have a powerful introduction.
Connect with your audience. Tune in and manage the energy of the audience.
Watch for body language, are people yawning, playing with their mobiles, or listening attentively.
Use appropriate jokes, relax your audience, and have fun.
Pause and change the tone and volume of your voice when making important points – silence is good.
Do not preach, repeat, pontificate, go on, or be dogmatic.
Use a variety of strategies to build trust and to connect with your audience emotionally, intellectually and spiritually – stories, questions, jokes, wisdom, emotions, and examples.
End with a powerful conclusion. Summarise key points. Leave the audience with practical steps, the way forward, strong and memorable impression.