No advice from the police? There must be some agency that offers advice and even financial help to assist with home secuirty improvements.
What about fitting a burglar alarm, installing a CCTV cam (real one, don't be tempted by the cheap 'realistic' versions, most people install those on the wall forgetting that it not having a trailing connection wire is quite abig giveway really!) displaying signs stating use of SmartWater or similar on property...
Consider their point of entry and improve that security masssively.
Baby monitors downstairs by entry points to pick up noises perhapsmight reassure everyone?
If you were out at the time, consider leaving TV or radio on audibly when out and light timer switches.
Or ask neighbours to keep a very close on the house if you are out working in daytime.
A good watch dog with a very loud bark and a menancing set of gnashers?!
Wonder if there's statistics on the net that details the time of return attempts, as if they already know you're out at a certain time they might attempyt breaking in at the same time again. I know that's scary, but it is true they wait for the insurance payout and the new 'stock' to come in!
My house is begging to be burgled, it's the smallest house on one of the most expensive roads in the village, end terrace with un-overlooked side alley and rear access, an old fashioned lock you can pick with a twig, wooden single-glazed windows I've prised opened silently with a peice of flat rock when I lost my keys one time and then to get indoors they just slide open the kitchen window (sliding window, no lock).
The only saving grace is they then have to carry my telly or whatever down the communal path right past my curtain-twitcher neighbours!
Have you warned your neighb ours you were burgled? They might be so concerned too they step up their own curtain-twitching or security surveillance.