Carry something to eat that you will leave alone until you are out of the woods.
Use a harness if in a tree stand.
Carry more than one knife.
In your plan specify when you are planning to contact someone to let them know you are safe. I always call my wife when I am out of the woods and headed home.
Carry extra ammo.
Also have an extra smaller flashlight. They are light and can be real useful late at night.

Always know your target and what is beyond it before shooting. Always.