I don’t remember when, where, who or how, but I once received a piece of advice I’ve never forgotten, which seemed wise at the time, and which I’ve since found invaluable.
“Every once in awhile, walk into a bookstore and buy a magazine devoted to a subject you know nothing about. Read it.”
There are magazines devoted to everything — sports cars, handguns, knitting, ferrets, Italian cooking, Civil War reenactments, log cabins, etc. Magazines are a terrific (and cheap) way to expand your horizons.