Your voice is a wonderful instrument for expressing yourself. The majority fall into bad habits and the voice which can attract listeners instead repels them. But with training these habits can usually be quickly overcome.
The famed orator Demosthenes started out in a worse place than most of us. He stammered but he was able to overcome this handicap by learning to control his vocal muscles by filling his mouth with muscles and shouting to be overheard above the roar of crashing waves.
The first step is to find out how your voice sounds. You can uncover how your voice sounds by means of recording it or with a little time you can listen to yourself as you speak in conversation and in public speaking. Analyze how your voice sounds to determine whether you speak: dull or high pitched, too slow or too fast, strident or with a nasal twang, slurred or clipped. Your voice to be friendly, sincere, forthright,vital and express feeling and meaning.
Speak as though you were speaking to a friend in conversation – using your natural style with any improvements you had noted, i.e. you want to overcome your voice bad habits with good ones , not by replacing them with a bad one of sounding forced and unnatural.
The advice of be natual but improve does sound a bit of a contradiction. But it is also natural to want to improve and grow.
To improve your speaking voice, the best method for eliminating the habits is to practice speaking by reading aloud. Put the feeling in your voice that reflects the words you are speaking and note the difference e.g. what is the difference in your voice when you speak word of hatred versus words of love.
By working out what your voice bad habits are and taking the time to sort them out you will eliminate them and replace them with sounds that are friendly on the ear.