Honestly - I wouldn't expect to hear back from them. All cruise lines get literally hundreds of resumes/CVs every day. If you said 'no thanks' due to salary, they probably had someone else lined up who did take the job.
I'm guessing that you'd have to apply for another position as I don't think they'll take the time to find what they think you could also do, especially since you turned them down once.
Wait and apply again? Or perhaps try another line . . . NCL is not one of the highest paying lines, but it helps to have cruise line experience to get the better paying positions elsewhere. You might want to rethink your salary expectations and take a short contract to get your foot in the door.