Here are some tips to improve your voice:
1. Improve your breathing. Good speech starts with good breathing. Inhale deeply through your nose so the air fills your belly—not just your chest. This will give your lungs more room to expand, and it will also help keep your diaphragm open so more air can flow through more quickly. This will naturally help your voice sound louder.
2. Slow down and lose the filler words. Faster speech will make you sound less confident, and will make you harder to understand.
3. Watch your pitches. Try to speak in a monotone voice and then try to speak in a sing-song voice. You'll notice that when you speak in a monotone voice, you sound boring and uninterested. When you speak in a sing-song voice, you sound more interesting and engaging.
4. Open your mouth and jaw more. This will help you project your voice better.
5. Learn exercises to relax your voice.
Here's a video tutorial on how to make your voice sound better by adjusting the vocal EQ zones . I hope this helps!