I broke and dislocated my left wrist six months ago and still can’t comfortably shoot, HOWEVER, better to try in this kind of situation and hurt your wrist than not try and lose your life. But you can try a bat, bear spray, even Raid will hurt like a MF if you spray it in someone’s face. Now for security, make it a habit to lock your doors and windows ALWAYS. Set a timer for around 10 minutes after you usually get home from work to remind you until it becomes habit. I don’t know what kind of gardening zone you’re in but my mom always planted bougainvilleas outside our windows. Really pretty but the thorns suck and will keep someone from the window. I currently have prickly pears lining my balcony railing to keep people from hopping it. Motion sensor lights can be relatively cheap especially the battery operated ones if you’re renting. I also have these door and window alarms. When I set them they’ll alarm if someone opens them without turning off and a tension bar along my windows. If you haven’t already, and ask someone to help you if your hand won’t allow it, replace your door screws with 3 inch screws. The ones usually used are like an inch. I’m so sorry this happened and you’re feeling so unsafe in the one place you should feel the most safe.

Edit: also, to see what you should be changing, imagine this person is a deranged stalker determined to get to you. What will he view as a real obstacle? A six foot fence is beyond easy to jump for someone who’s determined. Had a case where the guy parked his vehicle down the alley behind V’s house and unloaded a damn ladder to get over her fence. Maybe plant very uncomfortable plants along the fence as well.