What can you do to boost your chances of success? What can you control? What is outside your control? (For example, you can control the time you spend job hunting and where you choose to job hunt.)
If you respond to an advert in a newspaper, you can control the quality of your application, but you cannot control the numbers of applicants applying for the same post. You can choose to demonstrate your ability to communicate clearly and present your case well by submitting a well thought out, easily read and well expressed application.