Option A: Write more and gain a bigger audience so as to affect more lives.
Option B: Write less and only about things you're genuinely impressed upon to write about, so as to affect fewer lives in a more substantial way.
I'll let you guess which seems more kingdom-minded.
The other problem is that sometimes you just feel like you should write. And sometimes you have no idea what will affect people and what won't; often it's the things that seem least significant which end up really having an impression on people.