To help you show your value clearly, you should try to give examples of your significance. Pull from past professional or academic experiences. Talk about your unique skills that directly apply to the job at hand in a story that highlights how valuable you were in other positions. If possible, you could also show your value to the team by talking about what past team members thought about working with you. You could ask a past coworker or supervisor to write a reference letter and use it as a part of your answer.