Sachel Paige, a famous pitcher from the time when Baseball was segregated, reportedly pitched well into his 60s. His advice to young ball players was, "Keep moving, something might be gaining on you."
"Keep moving" is good advice for writers, too. Make sure something is happening all the time and that it hasn't happened before and won't happen again. This is especially true of dialogue, where it's tempting to write like people really talk.
In dialogue if someone says, "Where did you get that hat?"
The other character replies, "Macy's."
In real life, if someone says, "Where did you get that hat?"
The other person says, "Why, what's wrong with it?" But you can see that kind of reply would not move the scene forward.