I seem to recall last year a guys house kept getting broken into through the window. So he designed some “trim” for the window that was lined with 100’s of #6 hooks. As you can imagine, crawling through the window after that was painful if not impossible. Plus, the burglar usually left a little something behind.
I always liked that idea.
You could put a 3′ X 3′ piece of sheeting with a bunch of 8 penny nails pounded through it under the window as well. That makes a nasty place to land when crawling in the window.
Won’t stop the break ins, but will provide you with some satisfaction.
Put a trail camera in your house so you can get their facial expression when they find what you left behind for them.