A good way to actually improve your writing skills is by reading more. Reading helps improve your word vocabulary and knowledge of how various sentences and words can be used together.

Work on your grammar. This is important to eliminate errors in word usage that are so common to many writers. Review the rules of grammar usage and sentence structures and fragments.

Write more. This is the easiest way to improve your writing skills. Write more papers on various subjects.

Consider enrolling in a writing course or a writing workshop to improve your writing skills and/or to review grammar. Here you may learn how to apply more to your writing as well as develop better writing habits. Make sure you practice the skills you learn and apply them to your writing on a daily basis.