the monotony of just shooting
There is no such thing.
I can shoot all day long at nothing in particular.......pick a rock, a dirt mound, etc. I take cans and clay targets with me to plink at, and also shoot at bowling balls, watermelons, water jugs, empty shotgun shells, and the unlucky non-game animal that crosses my path. I don't really "need" to make a game out of it to keep from getting bored, I enjoy the time I spend shooting, whether I shoot 500 rounds, or 50. If I start getting bored, or am just not into that day, I go home, and head back out another day.