Better if you attach your previous or past work so we can rely on that on how you work, because even you have a "promising service" still that is not enough to prove your competencies in this kind of job, you know what there were lots of people here who can write better than yours so it is good to see how you work.
That's what I've read on other online jobs offering to freelancers like upwork websites, attaching past work a certain documents is called a total portfolio of the applicants. If it's the appearance being presented here in service section area, I believe that those possible managers who will hire the best writing services will appreciate the overall portfolio details and will hire if ever there's a big projects for future ICO.
