on Jane Friedman site:

Writers have to recognize and accept an essential artistic paradox that the more specific and individual things become, the more universal they feel.

That’s from an essay written by Richard Russo a couple of decades ago. I’ve been thinking about it a lot lately as I read stories in the submission queue, especially those by newer writers. I can tell they want to say something profound in their fiction. Why not? If you can write something that makes readers take notice, that makes them sit up from their reading and say, “Wow, that’s so true,” it could mean publishing success is not far off.

But many writers go about it the wrong way. Since they want to say something big and universal, they tend to write their stories in the universal. They create settings and characters that adopt the traits of universal subjects, which is to say they become flat and generalized, homogenized into composites. Sometimes the characters in such stories seem written to represent a particular side in a philosophical or social discussion. In reality, though, those “big” topics are so complex and nuanced that they can’t be described efficiently and adequately enough in a short story. The result then is a narrative filled with characters and scenes that don’t connect with readers, and a message that sounds artificial and predictable.

So how can writing about something small illustrate the great truth you have in mind?