Ok. You are assuming that all the unemployed in the UK are getting visas to come to the U.S. I am pretty sure that is not the case. Sure, most citizens of the UK can use just their passports to enter the U.S. and they aren't per-screened as far as employment goes, but for some reason, you decided that the ESTA Visa Waiver wasn't giving you the freedom that you wanted, and you applied for a B-2 tourist visa. You asked what would be strong ties. Sure, I'll give you a list if you like:
1) Minor children staying behind (having no visas or ESTA).
2) Spouse staying behind (having no visa or ESTA).
3) Owning a property or properties not easily sold.
4) Having an excellent job with excellent salary one would not easily abandon.
5) Owning a successful business that one would need to attend to or it would fail.
And then to a lesser extent:
6) Other close family members.
7) Other business interests.
Essentially, one has to prove that they have a pretty good life in their country and that they would not easily abandon that life.
As I said, all you can do is apply again and show that you have these things. I know it is frustrating and I am truly sorry about that. I wish I had an easy solution for you.