After your interview is a good time to do a review.
How did you do?
Where could you have improved?
Did you miss an opportunity? Why?
How can you avoid missing it in the next interview?
If you get a written transcript or audio recording of the interview, review it and ask a friend to review it. Take notes regarding what you did well, and where you’d like to improve. Review those notes before your next interview.
Remember that if you do this interview more than once, you may get a bit tired of your own voice. However, it’s all new to your audience. Be sure you sound engaged each time you do an interview.