I know the feeling, I am not keen on modern fiction too. The last fictions i read were Frankenstein and Lovecraft's one, those i liked.
Nowadays i mainly focus on academic litterature if i am knowledgeable on the subject discussed, or I read some science popularization essays until i grasp the concept.
Thanks for the the "Infinite Jest" recommendation, i enjoy downfall themed books for some reason.
There is something fascinating about the collapse (how did it happen ? why did it happen ? Could it have been prevented ? How ? What can we learn from it ?)