There is not much that can be said. You apply for jobs, try to get a foot in the door, try to make contacts and lastly make yourself more attractive to an employer. Other than that there is nothing else. You can be very committed to each of these things such as sending out thousands of CV's, applying for any jobs with operators not just as a pilot, travel the world to meet people in the companies, getting more ratings and experience. You are doing almost all of this.
Some people try to make themselves more attractive by paying for a TR and some take it further and pay for line training. I do not agree with that even a little bit but it does make people more attractive to some companies, that is a fact and those people will be more likely to find employment than you. That is the problem, most people are selfish and if they can they will try to jump the queue, there is nothing that can be done other than legislation making these schemes unlawful. It will not stop otherwise as there will always be someone willing to pay to sit in a jet as there are a lot of stupid people in the world who take a short cut that will ultimately reduce their future career earnings.
It is all about being in the right place at the right time or having your CV land on the right desk at the right time. I think you have been finding the right places but it is just the wrong time and probably will continue to be the wrong time for a while.