A waitlist is an actual list and you might be towards the top or towards the bottom. You are well within your rights to call and ask what your status is and to politely withdraw yourself from consideration if you feel you are too far down to have a real chance of getting accepted. If you want to remain on the waitlist, contact the school to let them know you’re still interested.
But, whether you’ve been waitlisted or deferred, don’t bombard the admissions office with calls, emails, letters of recommendation, questions, or testimonials from family friends. There’s a fine line, as everyone who has been on a date knows, between being persistent and acting like a stalker. If you win a new accolade, ask your high school admissions officer to call the school on your behalf. The news will seem more significant coming from a third party.
In either case, keep your grades up as schools will continue to monitor your academic progress. If you are offered a second interview, take the opportunity. You may be able to communicate your enthusiasm better in person.