Nikki McCormack: “Creativity is a small fraction of what it takes to be a successful author. If this is how you want to make your living, then get out there and live life. Get a job. Learn a skill (or many). The more you learn and experience, the better your writing will be. Understanding life and the people around you helps you relate better to your readers and that is critical to being successful.
Every writer writes what he knows, even if he's writing about little green men on Mars. You create those little green men from what you KNOW.
This means you need to live your life. Read the above article of advice for new writers. It's valuable advice for every writer.
You can't just "be a writer". You need to live life.
The more you've lived (all things being equal) the more you know. You bring what you know to every word you write.
We writers use everything that happens to us. In the throes of childbirth, you store up impressions to use in your writing. Your home is burgled; you store up ideas. You read a news story, you think about how you can use what it tells you about human nature in your writing.
You laugh, you cry, you live... and you write.