Dave Wirth
If there was only one practice, one routine, that would make us extraordinarily productive in any pursuit (especially creativity), it'd be Julia Cameron's suggestion that we create at least a little something every day. I like to call it the the 75-five idea. She dedicates three simple pages of gobbledygook in the morning. She writes even if she doesn't feel like it, and she gets stuff done.
What difficult project wouldn't be solved if a simple five minutes per day, every day, would be dedicated to it? Your first poem? Novel? Painting? Playing a song by Beatles? What would remain unsolved? What possibly couldn't be accomplished?
In my opinion, absolutely no problem is immune. It may take a lifetime, or even several people's lifetimes, but eventually it will be finished.
