I've always thought Aragorn's children must feel isolated beyond the usual for a king's children, and you're bringing this feeling beautifully alive with your story. To me, it seems also hard to be the son and successor to such extraordinary people as Aragorn and Arwen have been, and you bring both so well together in this line:

His mentors were departed or departing, and he was left to be just another forgotten king of a prosperous land that had no need for heroes or the glory of noble lineages.