Hold in the back of your mind the notion that someday you’re gonna write a book. You don’t have to write it this year. Meanwhile, writing begets writing. Just get into some kind of situation where you are writing, and if it’s some various thing you’re publishing online, it’s still grist to the mill.
Legendary nonfiction writer John McPhee in an interview with GQ at the tender age of 92. For further reading, see Draft No. 4.