Practice from a key-word outline, reading only direct quotations. Work on integrating body language and visual aids into your verbal message. Check the timing of your speech. Practice in front of friends, listen to their advice, and make changes if necessary. Practice some more until you feel comfortable and confident.
Research shows that delivery directly impacts other speech elements.
It determines how well your speech is understood. It highlights important points. It makes transitions. It can create a hook and give a sense of closure. Improving your delivery, therefore, will improve your speech as a whole.