Here are powerful affirmations to help you improve your voice and confidence for public speaking:

1. "My voice is clear, strong, and confident."
2. "I speak with clarity and purpose."
3. "I am calm, composed, and in control when I speak."
4. "My words inspire, motivate, and connect with my audience."
5. "I breathe deeply and speak with ease and confidence."
6. "My voice resonates with strength and authority."
7. "I am comfortable and confident in front of any audience."
8. "Every time I speak, I am improving and growing stronger."
9. "I trust my voice and its power to convey my message."
10. "My delivery is natural, engaging, and impactful."
11. "I enjoy speaking in public and sharing my ideas."
12. "I project my voice effortlessly, reaching everyone in the room."
13. "I remain calm and confident, no matter the situation."
14. "My voice carries warmth, energy, and authenticity."
15. "I speak with passion and conviction, and my audience listens."
16. "I am a powerful and effective communicator."
17. "I pause when needed, allowing my message to land clearly."
18. "My nerves are a sign of my growth, and I use them to fuel my success."
19. "Every word I say adds value to my audience."
20. "I deserve to be heard, and my voice matters."