I'm recording episodes of my new podcast, speaking on front of groups of around 200 people and getting on a lot of conference calls and I want to develop that charismatic and influential voice that exudes confidence and authority.
Talk more.
Game walkthrough comedian Markiplier had his voice deepen considerably over the past couple years.
https://www.youtube.com/user/markiplierGAME
Don't concern yourself with his CONTENT; find a video from 2 or 3 years ago of his and listen to his VOICE...then listen to a recent video to hear just how much it has changed.
You obviously don't have two years. But merely by talking consistently will exercise your vocal cords and result in a deepened, stronger voice.
A vocal coach is a paid option.
Youtube searching for "how to improve my voice" came up with a bunch of video results.
