I have 27 posts with all 1500 words and still i got this mail.
Add some more contact information other than contact form.
Anchor text “Contact Us” in your about page is unlinked.
Add some links to your social media accounts
Are all the article original?
use siteliner tool and other tools for duplicate content. Copyspace works great if you can pay some bucks.
Usually this error happens when you have high propotion of duplicate content
I have created policy page using plugin does it create problem?
Yeah. Many peoples use the same plugin so, the generated page is everywhere same(duplicate content). So, I would recommend to do some edits to avoid duplicate content.