Harry and Draco lived a peaceful life after their own troubles. They both eventually became professors at Hogwarts, both for DADA as the amount of students increased to the point of requiring multiple positions. The school was also expanded further to accommodate, not that the castle begrudged it. Even though Ilvermorny resided in Avalon, the number of magicals grew each and every year. Sooner or later, another school might be needed but was fine for the time being.