Some ideas
Game mode Claire Pulls Up: She gets a gun
Also you should make it where you must go to all the doors instead of two.
Hidable Lockers able to hide from teachers like the old version except for they can find you in them.
Add more food for other teachers: like Fish for Thavel, Twinkie for Bloomie
I have more ideas but don't want to overwhelm you
also please brighten the gym during the Alice thing