Writing is an art, requires skill, requires practice, requires thought, requires something transcendent.
Write when it needs to be done, begs to be done, won't allow you to do anything else but write.
Write about everything, everyone, everywhere, all the time, shamelessly.
Share. But even if you don't share with anyone, write.
Write letters, essays, poetry, stories, posts, articles, journal entries, lists.
Writers are people who write, not people with interesting ideas, not people who want to be published someday, not people who are too busy to write.