Dear Sir, I would be so happy to become a member of your team!
I usually spend a few hours to write a 1000-word article, so I think I will be able to deliver up to 5 articles per day.
I am a full-time article writer looking for a long-term project.
Just let me prove that I deserve this job: let me complete a test task, and you will find make sure that I am an honest and reliable worker!
By the way, usually Grammarly finds only 1-2 mistakes in my articles, I fix them, and everything is always OK!