I'm more than happy to help you polish your cover letter. I am a native born American with a college degree. Although I freelance now so I can stay at home and take care of my mother, I spent 25 years in a successful career. I've written and reviewed more than my fair share of cover letters. My career was such that I moved from organization to organization every 5 years or so (local government) and eventually I made supervisor, then manager. As a manager, I hired dozens and reviewed literally hundreds of applications. A well-crafted cover letter is the first thing a hiring manager sees and if it's doesn't catch her/his eye, it may be the last thing they see of your application.
I've helped clients with a thesis, a novel, eBooks, articles, blogs, websites, academic applications, job applications, cover letters, resumes, and much more. I can help you, too.