Im in exactly the same boat and have had rejection after rejection. Same old story - not enough hours. However, I spoke to some people at various airlines who have said they don't want some guy with 2000 hrs in a Cessna they want quality jet time even if its only some guy with 500 hrs total. Where are you gonna find someone in that position?
I really can't see anyway of making yourself stand out from the rest unless you spend yet more money on further training. And even then there is no one willing to guarantee that they will give you a job.
It is sickening that no other career out there would require someone to fork out 40,000 to train and still ask for you to complete a selection process to prove that you are commited and won't waste there money!! What a joke!!!