i am a ballet dancer my self to be able to become a better dancer, you need to be able to hold your posture throughout the dance also to hold your turn outs of your feet from your hip, you will achieve this by tensing your bottom muscules; i hoped this helped!
You need to be determined and patient when becoming a proffessional dancer. If you work hard enough you will be the best!! It is best if you participate in activities that can help you become a professional dancer such as ballet and gymnastics.
you need to have energy. Most of the time you must be able to at least do 1 trick in an audition to catch the judges eyes! And you just need to show that you love having a real job satisfaction and you want to have a job that would allow you to be creative.