A good one from David Perell which I had quoted below: 

"But when you write regularly, you start observing those things because the pen turns you into a curious detective who is always hunting for clues.

So much of effective writing is being attentive to the world in ways that other people aren’t.

The more observational you become, the faster you find new things to write about. Over time, you realize that there is an unlimited number of things to write about."

Many people made the mistake of writing to be read. Choose to write for yourself.