I dont know how to get out, i only have a couple hours until night. i found an old phone with some battery left. i recorded this desk with some stuff on it. hopefully you could be able to tell where i am.
Noclip through the object that i put in through the computer inside The Beginning, if I'm not correct, it will teleport you to Level 3999, Oh and, you should be invincible now, Safe travels, wanderer! -Entity "Building"