Not joking, buy and read books. Old books are only written by people. (and the help of an editor)
Fun fact: Editors are usually also people. Except for that one dog I met during a cold winter's day in 1987 in a run-down London pub.
Or read magazines and newspapers from reputable publications. My grammar and writing have improved tremendously from reading quality magazine articles, e.g. stuff from The Atlantic or The NY Book Review or whatever.
Both magazines and books are valid forms of information consumption and books are not the only way to improve your writing, reading, and understanding of the world.
Nothing has made me want to read classic literature more than AI. For the first time in probably over a decade I even went to my local used bookstore with a list of books to buy, but sadly none of them were in stock. I have had a bit of luck at little free libraries though.