A huge castle where you can learn magic, explore and live adventures with your friends? There's a reason there was so much success for that saga.
JKR is a horrible person, but that universe is still there for people to create and share stories. There are a few fanfictions out there that are better than the last books.
But I also want the fantastic beasts too. That book is way more interesting! Same universe but less about the school and more about finding the creatures.
Oh I like the whole universe, but the creature in the main guide book "fantastic beasts" were what I liked more.
I like the moving stairs in Hogwarts and the magic map they use. Never read nor do I know if there was an actual novel for Fantastic Beasts movie. Just the guide book that was a supplement to the HP series.
There was also a quidditch rule book that was cool. I wish I could play quidditch. Even without flying IRL would be a creative challenge. No golden snitch. Just hitting quaffle into small hoops might be fun while running around a field or maybe on horses IRL.