There are three key phases of a persuasive speech - credibility, visualization, and reinforcement. During the visualization phase, demonstrate to your audience through stories, anecdotes, and other forms of visual images, how their lives will be enriched upon adopting your point of view. The third and final step in an effective persuasive speech is the presentation. A persuasive speech must come from the heart and not from your notes. The introduction and the conclusion, as a minimum, must be delivered from memory.
Eye contact is critical, as is vocal variety.
A persuasive speech must be passionate - your voice, facial expressions, body language, and words should blend in perfect harmony to convince your audience not only of the importance of your message but also of the depth of your own convictions. If the audience detects even the slightest trace of insincerity, you will lose them forever. Practise your speech. There are no short cuts to delivering an effective persuasive speech. I hope that they will be of some help to you.