No easy solution. If its not chained to something, a nice-ish bike and you park in the bay regularly expect it to be stolen at some point.
If it is chained with anything less than something of Almax quality, also expect it to be stolen at some point.
One member on here had some people cutting through his Almax with petrol cutters and was most of the way through when they got interrupted by residents.
So in short, buy a shitter…