Whats wrong with your current airline, why dont they want you? Its unusual for an airline to line train you and then toss you aside, unless they don't like you or you bought your hours and must have money to burn (or rich parents).
I too am in your situation and the market is bleak for 757 recruitment at the moment.The big 4 are uncertain what is happening due to recruitment and may lose jobs/planes.Try 767 operators as more chance.Try aviationjobsearch. Jet2/titan/flyjet not recruiting.DHL finished. Try that Flygobe lot.
But why not just buy some more hours! That lot must have cost you £20,000+, then TR £20,000, then training to CPL etc.
Best bet, stay where you are!