Roberto Bolaño. 2666 and The Savage Detectives are great. He also wrote a ton of short stories. His writing is also pretty straightforward so it's easy to follow if you're still learning.

Luis Sepúlveda. The Old Man who Read Love Stories and The Story of a Seagull and the Cat Who Taught Her To Fly are both very good. The latter is more of a children's book but still worth it.

This page contains a collection of many authors and short stories. I've found it helpful: Literatura.us

This is another great resource for popular books by country: https://preply.com/en/d/most-translated-books--lp