The best things to keep someone out? Make it hard to approach without being seen- you have cameras and lighting- that's a good start. Unfortunately, many people like privacy and that helps someone who wants to break in but again, the cameras are there- as long as there's no way to defeat them or interrupt the recording, whatever happens will be viewable. Make it difficult to break in- solid, strong doors/ good locks/solid door jambs and limit access to the windows, so it's not a matter of walking up and climbing through. Make entering from a second floor inaccessible from the ground without a ladder and then, make your ladders inaccessible.

If that fails and you have repeated break-ins, I guess moving is about the best option because the crime level won't decrease quickly unless, like my neighborhood, it's only one or two dirtbags and they're put in the slammer.