I don't read contemporary literature in Greek anymore, because we are drowning in really, really bad writers.
I would advise reading books, even the Classics, in their original language if you can. My French and Russian was non-existent, so I had to read their Classics translated in Greek, but I've seen terrible, "mechanical" translations with no flow from books I can read in English and Greek and I was mortified. I happened to read a few pages of Harry Potter in French and it was legitimately awful work.
I learned English through Stephen King, John Lescroart, John le Carré, Ernest Hemingway and the likes, but not many people at that age like them. Rosamunde Pilcher is also a good choice. Also, I used to read articles, when journalists were professionals and not professional social media content copiers.
Yes, I'm aware my "contemporary" is last century.