Looking for job, worked over 15years

I am working in a MNC as an senior accounts clerk and I had been working for over 15years since left school. I have BA (Hons) in Accountancy (distance learning) in 2004. Lately, I really upset with my job and wanted to quit. I am looking for a job as an Assistant accontant but seems not easy as people said. I have tried to send the application but no feedback even for interview :(.