If I understand your post correctly, you are looking for someone to help you (long-term) rewrite articles that have already been written.
If you are looking for a native speaker of English, I may be the person you are looking for. I am new to Freelancer and looking for work and ways to up my ratings. That said, I am not new to editing or rewriting. I have worked at the university level correcting undergraduate papers, and, while living in Kenya, Japan, and China, have helped countless friends and colleagues improve their written documents.
I would be happy to hear more about your projects, the time commitment you are looking for, and any other details of the job you would be willing to share.
Thank you for your consideration!