Hello, the main task is only okay if you go down. All the main tasks don't need to find a specific place. As long as we defeat the cemetery boss, the task is completed. You can't find your way. Maybe you didn't look at the map carefully. You can enlarge the map and look for it bit by bit.

After a few floors, I naturally arrived at the director's library. This place is like a damp room. Every big terrain has several floors, and the last floor is the room where boss stays.

I hope my answer is helpful to you and I hope you will adopt it.