Any suggestions to make this tool better? (A tool to find relevant guest blogging opportunities)

We are in the process of making this tool that lets you find websites with relevant guest blogging opportunities. I’m looking for suggestions to make this a better tool for content marketers.

Right now, the tool we are building lets you find 100 to 200 websites, that have relevant guest blogging opportunities along with the DA of each. Would this tool be of use to you as content marketer? What would you add/change?