Please suggest me books (hard mode, I’m picky)

I'm going overseas and hoping to stop by Dymocks on my way (I am from the outback so do not suggest online ordering please, ain nobody got time fo dat).
I'm hoping to compile a list of things I can at least look out for.
I'm not a genre reader, but I know I lean toward classic and "literature". Anything remotely human condition explorative. fiction preferable but I am a philosophy/history nerd too.

Some titles I highly enjoyed:
Flowers for Algernon
Valley of the dolls
Catcher in the Rye
The bell jar
The collector
Perfect days
No longer human
The stranger
The ego and its own
Wild swans
All quiet on the western front
Negative space
Amygdalatropolis (literally everything by BR Yeager)