Please what is anchor ratio,it essence and how to determine that of a site?
If you have a site about baby strollers and all your anchors use those words, then you risk over optimisation.
Using a good seo tool, such as Ahrefs, you can see what the anchors are that are being used on a website.
Read this article ( I share this often )
https://domainshighway.net/mastering-the-art-of-choosing-your-anchor-text/