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1. First things first, always have light humour in your speech.
2. An anecdote on a famous celeb or a professional will uplift the audience to focus on what comes next.
3. Be interactive with the audience.
4. Relate to them as to how the speech can help them in their personal lives or work.
5. Tell them something useful and they don't already know.
Hope this helps!
How much you can relate your speech to the audience, how you can bring down your speech to the level of the people, people who are your audience.