Hello,
Thank you for looking at my proposal. I have done content writing before and having gone through your job post, I clearly understand what you are looking for. I have some good news for you, if you are looking for creativity and a content writer who loves his job, you have got the right person for this task. I would like to be part of this project and I am confident that I can help you bring out the expected result.
I have an offer, why don't you let me do the first content for half the budgeted price,then, if you like it, you could link up with me for a long term project. How does that sound?
I am vailable for interview and ready to work within your budgeted pay rate. Thank you once again, looking forward to hearing from you soon.