I had a three day existential crisis after reading Blindsight and I reccomend following it up with David Graeber's What's the Point if we Cant' Have Fun? as a palate cleanser so you don't blackpill.

https://www.rifters.com/real/Blindsight.htm - Blindsight is a quick read and it's available in it's entirety here.

CW: sexual violence, cannibalism, cosmic horror, cosmic horror, and cosmic horror.