A winning cover letter generally consist of three parts which amount up to three paragraphs. In the first paragraph, you will detail why you are writing the company. This will provide context to your intentions for writing the company, which is to apply for a new job. Also, try to provide clues as to where you found out about the job posting and what got you interested in applying. The second paragraph serves as the gist of your cover letter. Here is where you explain what you can offer and what skills matched the job requirement. If you have other skills or achievements, make sure to point them out by referring to your resume. Make sure you can convince them to read your resume.
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.