You've written your speech? Great!
You're now in the right place.
It's now time to start rehersing.
There are many techniques you can use when delivering a speech. Think about your context (is it humorous or serious?) and how this will affect the way you use your voice and body. Note down specific sections of your speech where you could use appropriate delivery techniques. Some you could consider are:
Varying your volume, pacing and tone to emphasise a point or hold attention.
Pause for dramatic effect
Eye contact to engage and hold attention
Gesture, movement and facial expression
Stance that is appropriate for speaking situations
Use of props/materials if applicable