I recently finished Infinite Jest by David Foster Wallace after about a year of reading it on and off. I'd recommend it to someone who is ok with putting a lot of time in since I found certain sections slow and quite dry. If you push through those bits though I think it is worth finishing. The highlights for me were these long almost stream of consciousness sections where Wallace just writes expansively on (sometimes very plot unrelated) topics for pages at a time, in particular his long digression on the psychology of top level competitive tennis. IJ is also one of those books (springrolls mentioned house of leaves above) where you will get as much if not more out of it on subsequent readings as you did on the first (or cheating and reading online about all the stuff you missed like I did).
For a somewhat shorter and more accessible while still great example of DFWs writing I recommend his essays, in particular Shipping Out (https://harpers.org/wp-content/uploads/2008/09/HarpersMagazine-1996-01-0007859.pdf) which is 100% worth reading if you have a spare hour or two.
also lol title i started the brothers karamazov yesterday.