Resume' only gives you a chance to be called for an interview. It's more like your visiting card. It reflects you. The prospective employer prepares to meet you based on the contents of your resume'. Think about a complete professional approach instead of the past indifferent hit or miss approach.
Football teams can reach the final only when they play the league matches seriously.
Resume' is your first league match. Look at the hiring process from the employer's point of view. There you are with a stack of resumes on your desk and a job to fill, right now. Wait a minute. As an employer, I want to see what you can do for me, but all you're telling me is what you've done for someone else or somewhere else.