It takes 21 days to make a chick. It takes 21 days to form a habit.
According to Carlos Xuma, if I concentrate only on one habit or belief, for 21 days, I can have 15 new beliefs in one year! That's change. He said that, what's important in affirmations is tracking progress, not the affirmations themselves.
What if you take 21 days to improve your voice? 21 days to improve your body language and presence? 21 days to work on your discipline? 21 days to review your beliefs? How would that do to you as whole person?