Your conditions aligns well with my capabilities and I believe, I would be the right person to do this work. I have already experience in article writing on diverse topics and my proficiency in English, verified by IELTS exam, strengthens my understanding of and writing in English.
I would be happy to provide a small sample on your provided topic to help you better evaluate my application.
Moreover, I agree to your 3usd/1000 words conditions along with others.