A Potential LNC with a NICU background

Hi everyone! I have been a NICU RN for 6 years now, straight out of nursing school. Although I love my job, I'm ready for a change. I've always been interested in becoming an LNC. I did, however, recently apply for a case management position and did not get it b/c of my lack of adult experience. The hiring manager said I had the potential to be great at the position, I just needed the experience to back it up. I'm wondering if this is going to apply to becoming an LNC? If so, should I start over and (as much as it pains me to think of this...) begin working with adults? And, also any recommendations on courses/literature to prepare for this? Thanks so much...