Outside of Radio there are other activities you can get involved in to help your development. Take up any chance you can to do public speaking whether that be announcing the bingo or being a MC for a local event. Other things you can try to develop your personality, character and tone are getting a vocal coach and joining a local Theatre or Dramatics group. To be a great presenter you need to have personality and be a character which you have to be able to put across by your voice alone so this is why extracurricular activities like these can help.