Dear sir/Madam,
This is to assure you that I am the correct candidate for this job. Having a background in English Literature and content writing, I will make sure the work is precise and quick. Being self employed I can put in the required time and effort to complete the task.
You could also send me some sample work to complete. This will allow you to have a better judgement of my capabilities. Looking forward to working with you.
yours faithfully,
Shazad.