Landing a Pediatric RN job in NYC

Hi, I have been a nurse for 2 years now in the adult cardiac telemetry unit. I am seeking to transition to a pediatric unit or mother baby unit since it’s my dream unit. I am a per diem school nurse on the side. However, I have not landed any interviews and my application gets rejected. What can I do to boost my chances getting an interview at least ? I thought having some acute RN experience would have helped by now.