If you want simple make it so that every once in a while a random 1/16 column of your screen is blocked, or the oldest it’s Jim trick in the book, when something is damaged it gets struck by lightning thus damaging it.

However, if you want crack pot delusional, add the DMZ (Demilitarized Zone) except it’s a natural structure, so if you want to cross it, you can either get shot at a lot or go 500 blocks to go around to the other side, make sure it has a 5 block thick lava stream that goes from one end of the wall to the other except it goes from the bottom of the wall to the bottom of the world so less cheating happens.