From the physical security perspective, you want to implement your security in depth/layers.
A reasonably inexpensive change you can make that will deter all but the most brazen and prepared is interior metal doors and door frames. Most interior doors can be kicked in any adult quickly.
Using the metal door and frame on your bedroom and perhaps your study/office will not only give you some greater peace of mind, but buys valuable time for the perp to either abandon the entry, or for help to arrive.
In combination with the previously mentioned alarms, shatterproof windows and cameras, you can enhance protection for hard-to-replace items, and potentially yourself.
