Write well. Write often. Edit wisely.
Many writers face the curse of first-person narration—too much exposition at the expense of scenes. Guard your novels against the overuse of telling. Yes, one more article on showing vs. telling.
Scenes—someone doing something somewhere—are the pulse and images of the novel. Don’t skimp on scenes. Use exposition to connect them, but be sure you write them. Listening to a character’s thoughts, without knowing where and when he is, can make for dull reading.