When all your best efforts are not giving results and there is fear of losing your job, how to overcome this fear?

When you know that the results are not forthcoming, that you have not contributed enough to retain your job, the chances of losing your job will be high. You have to change your style of working to ensure the results improve. So, go back to your work and as you improve the quality of work and your contribution to the organisation goes up, the fear of losing your job will go.