Make the effort to stay in touch. Immediately after every meeting or interview, write a brief, personal note, thanking the individual for their time and consideration. This shows appreciation and respect and always makes a good impression. Follow up with a discovery phone call. Invite feedback and recommendations.
People love to help others, especially youth.
Listen for insights about what the company saw in the chosen candidate, and what you might need to work on in order to qualify next time. Your willingness to hear constructive criticism suggests a desire to grow and learn. Record their observations in your journal so you can consider them in your next search. Then check in after two months or so. Standard procedure is for companies to hire on three months' probation.