Eliminate the consumption of alcohol and reduce intake of dairy products. Alcohol dries your throat and dairy creates phlegm, resulting in a thicker sound.
Avoid using a flat tongue when singing. Placing the tongue flat against your mouth is harmful as it creates tension within the vocal folds. It also creates a hoarse sound with an inability to dictate clearly.
Adjust your tongue until you feel a resonance in your nasal cavity. This will increase the amount of ring in your voice and allow you to sing with a natural lighter voice.
Learn to sing in the head voice register. To accomplish this, sing a scale starting at a low point in your range. Sing until you feel a register change in which the forehead creates the sensation of vibration. Head voice is a healthy way to sing lighter music.
Select music that is in your register. If you are a soprano, do not sing mezzo literature, as it will not fit your voice properly. Evaluate your range and find the voice type that is most comfortable for you.