Set Booby Traps
Forget those Home Alone style booby traps which are going to cause you more problems than any potential burglars. Instead, you can show the burglars that you are on to them and deter them from targeting your house.
Try gluing a fake key underneath your doormat. When the thieves spot it and think they’ve struck gold, only to realize it’s glued to the ground.
They will assume they are being watched and leave! If you have a security camera it can be funny to watch these opportunists fail so spectacularly.