I learned from a very young age to never ever say I was bored. If I did, my mom would hand me cleaning supplies and put me to work. From then on, I have always learned to occupy my time 100% of the time.
There's always something to be done, unless you are filthy rich and pay someone to do everything for you. Take up a new hobby, buy some different guns, fix on your house......
Then, when you look at your guns, and you get the itch to punch holes in stuff, or knock things over, you'll know it's time to pick it up again. Or as others suggest, try some more challenging shooting. Move the target back. Go to a moving target range. When paper gets boring to me, I throw a shooting ball out on the ground and try to hit it while it is still moving around.