Your vocal cords are muscles, appropriate exercises and maintenance will bring considerable endurance and stronger performance in your auditions and recording sessions.
Two essential things for exercising your voice: Deep breath, with control and making sound.
Work on breathing from your diaphragm will help to correct some problems. As your exercise your voice, awareness of what is happening physically is vital to develop your ability to experience yourself as you work on changing a habit.
Keeping your voice in good condition is crucial to keeping your performing abilities at their peak.