Advice on increasing waitlist conversion chance

Hi everyone, I was waitlisted by CMU MSCF. I know that I should update my resume to include recent projects and courses, but besides that, I am not quite clear on how to increase my chance of getting an offer. I also heard that I should send a letter of continued interest to the program.

Does anyone know what I can do? I am supposed to submit new materials before April 20. BTW I was interviewed in Jan but not sure if that gives a higher chance of conversion. Any insights or advice would be much appreciated!
 
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