Harry Potter: A Witch’s Guide to Self-Cultivation

The magical world was written very well before, but why did it suddenly disappear? It's a fanfic though. But the magical world before was really well written. Did you travel through time without explaining those things clearly? Will you wear it again after that?

The only book I have read that looks at the story world from the perspective of the protagonist. I hope there will be more descriptions in the HP world. No matter what it is, the author will update it.