No, you can’t paint the Mona Lisa or write Huck Finn on demand.
But you can create on demand. You just sit down and do it — and, the more frequently you do it, the easier it becomes to simply produce something.
When you’re in that space, that’s just what you do. No distractions. No hiding.
Of course, the law of averages says at least half of the results will be below average.
But the law of large numbers says that the more you do this, the better you’ll get.
Create every day, and your average will go up.