Familiar and Comfortable
The difference between familiar and comfortable is this:
Familiar = what the mind knows as common
Comfortable = how you feel inside or how your heart feels
And people often stay with the familiar, even when they are uncomfortable. Somehow, somewhere people often think familiar and comfortable are the same thing. They are familiar with it and don't want to change because they thing that is what makes them comfortable. Not realizing comfortable has nothing to do with familiar. You can feel comfortable when you are familiar or when you are NOT familiar.
So the action step(s) for this insight would be recognize when wanting to stay in the familiar is holding you back in life and take action anyway.
Recognize when you are uncomfortable you can still have the familiar. And sometimes to be comfortable means going to the unfamiliar.
What most people want more than anything is comfortable, not familiar. When you remember the difference you can more easily move towards comfortable, even if it is not familiar.