After every interview I send the note that reminds them why I stuck in their mind. Even when the answer is not right now, I have learned to leave the door open instead of slamming it. Months later a not now turned into a call, and I was glad I had kept it warm.
More people experience this than they realize.
You've learned to follow up so a not now stays a door left open.
If this sounds familiar, the Library can help you find the bigger picture.