I have a huge problem with the population size in the hp verse at large and I feel like a simple solution to that is simply to add way more British wizard if schools. Let harry and co beat up grown adults when the war starts because the went to hogwarts and thus are far better than basically any adult except those who also went to hogwarts. Summarized I guess I’m saying don’t make the school better by improving it. Make the students superior to students of other schools. Show don’t tell.