Dear Ruol,
I am writing in regards to the freelance writer position that you have posted. I am passionate about writing and I believe that I have the skills that are required for this position.
I have been writing for many years and I have a strong understanding of grammar and punctuation. I am also able to communicate effectively in writing. I have a strong interest in many topics and I am always researching new things. I believe that my skills and my passion for writing would make me an excellent candidate for this position.
I am excited about the possibility of working with you and I believe that I can be a valuable asset to your company. I look forward to hearing from you soon.