please not speak very fast
Remember: an excellent speech does not require a brilliant orator - you can do it. Winston Churchill is commonly regarded as one of the greatest speakers in the English language, yet he regretted the lack of practice in public speaking that he would have gained had he gone to university and he suffered from a slight lisp and a stammer. The key is preparation.
You are probably making this speech at an event that has a program that has been published beforehand. So make sure that the title of your speech is catchy and then people will be looking forward to it even before the event.
Making a good speech starts weeks before with thorough preparation. You should have been thinking of themes and points, noting down ideas and sources, crafting phrases and sentences.
The best speeches tell your audience things they didn't know and/or give them insights they didn't have. So:
In respect of the first, research some salient, accurate and up-date facts and figures.
In respect of the second, look at the subject differently - think 'out of the box'.
You should have finalized the notes or text or slides at least the day before, so that you can concentrate on reading through the material, becoming very familiar and comfortable with it, and thinking about the actual delivery.
Огромное спасибо!!