You can always write your product listings by yourself but, convincing a customer to purchase your products over that of your competitor is not as easy as it sounds. The listings must be stuffed with the right keywords, long-tail phrases, and search terms in the right frequencies, at the places. You must optimize your product listing find a high rank in search results and become visible to potential customers.
It is a task that only professionals can do best. You must thus, consider hiring a professional copywriting expert from an Amazon SEO Agency to write your product listings.