Biggest problem the Aida ships have is that they are built for such a unique product that they’re not suitable for most ‘traditional’ cruise lines that would consider something her size, such as no sit down main dinning rooms they’re all buffet style as such they have much smaller galleys and have a very low crew compliment for their sizes, so most lines would need to find space to increase both of those things to offer a more standard experience onboard.
My bet is either Celestyal or Margaritaville she could suit both of their very casual laid back port intensive short cruises.