Increase the spacing between paragraphs and bullet points. Basically put, you will want to make sure your page is not filled from top to bottom with text. Make sure that there is white space on your letter. It just makes it easier to scan or read. Limit your paragraphs. This may seem difficult to fit in all of your information, but you will want to keep the maximum amount of paragraphs to 3. Similar to when you read an article on a website, the longer and more paragraphs the content has, makes it seem like a difficult read.
A cover letter, as used in the job_hunting context is a document that is supposed to provide an introduction to the resume or curriculum vitae, which are the basic document employed when marketing one's own services to a potential employer. In the traditional way of doing things (when job hunters used 'hard copy' applications), the 'cover letters' was typically attached on top of the curriculum vitae or resume, thereby typically serving a cover in the literal sense of the word, to the Curriculum vitae or resume; and it is probably from this fact that it probably got its name 'cover letter'.