I'm in the exact same boat as you, well actually you have more experience than I do in some ways. I've been a nurse for over 12 years as well. I started out in a peds clinic, then moved to a postpartum unit where I was cross-trained into the Special Care Nursery. I did pool home visiting during that time as well, again with peds. I then moved into a level III NICU. During this time I also obtained my BSN and then MSN degrees. Now, with my educational goals complete, I set my eyes on Case Management to ride out the rest of my career doing. I have had a few interviews with no results. I feel as though I'm in a catch-22 of sorts. Not qualified for the CM jobs that relate to my background, and not qualified for the CM jobs that would be considered more "entry-level" since I've not really worked with adults, outside of new mothers, since nursing school. Sadly, my state doesn't appear to have any nearby inpatient CMs requiring my background (or they're all filled so I never see any).
I'm thinking my reply isn't very helpful to you except I'd tell you to keep trying and look towards every interview as a learning moment. When answering questions, use the STAR method (situation, task, action, result) to answer them (helpful advice I received from another poster on here).
Hope that helps a little!