The phrase "to improve those chances" means to do something that increases the likelihood or probability of achieving a particular outcome or result. Full definition
However, there are a few ways of improving your chances of getting your credentials past HR and into the hands of those who actually make the decisions. (news.efinancialcareers.com)
Reducing the amount of money you're asking for is another way of improving your chances for approval. (creditsesame.com)
Which greatly improves your chances of getting that interview call. (youtern.com)