If it helps any, when trying to get the switch through the hole in the wall, I ended up destroying the fallen bookcase; could not get the right point of balance anyway. However, if you go to the veranda opposite you can get a clear shot to the switch. As I said hopes it helps.
There is a chest at the very very top with a bird's nest. You have to double jump to make it up to it.
ua-cam.com/video/OY6rRQCfvC8/v-deo.html Full quest playthrough here with timestamps!
If it helps any, when trying to get the switch through the hole in the wall, I ended up destroying the fallen bookcase; could not get the right point of balance anyway. However, if you go to the veranda opposite you can get a clear shot to the switch.
As I said hopes it helps.
You need to edit out all of the garbage in between all of the useful info