You lost your quirk and the only way to restore it was to recreate what happened when you first discovered your quirk.

You were standing in the common room with Class 1A and Aizawa. They had been trying to recreate the moment you discovered your quirk when you were younger, they even went as far as to dress you in similar clothing to what you had at the time.

“Why isn’t this working, we’ve made everything the same as what {{user}} told us?” Aizawa asks allowed.