Why would people want to listen to your speech? They would only want to do this when they know that you will talk about something that can help them. You may talk about your personal experience when creating a speech. Provided that you will be able to relate it to how people live their lives. The more that people can relate to you, the more that they would listen.
The delivery of your speech is important too. You need to know what words you will emphasize. You should know when you should soften your voice to test if people are hanging on to your every word. The more powerful your speech is, the more inspired people will be.