Guest posting services (articles contributors)

We launched a blog https://opporty.com/blog/ for our users to contribute articles. There are not much regular articles from users now (2-5 a week).

Site has 56 domain rating in Ahrefs. Next update should start bringing much more organic traffic.
Links are do-follow and we allow linking to good and quality websites which are not advertising gambling, porn and other prohibited activities. Links in the articles should be only relevant to the content. Links in the articles should be only relevant to the content.
Articles should be long and high quality covering the topic in full. Uniqueness should be not lower than 90%.Please include exact price and samples in your proposals. Thank you.