Competitor with few backlinks without value overperforms

[Leonidaspap]

I have a competitor that is "first" on the 50 most important search terms. He is "first" without fluctuations for the 6-9 months.

This competitor have only 98 backlinks from 21 urls where the 50% is with no value.

The 50% of the high valued links is redirections form google in the following form ==> https://www.google.gr/url?q=https://xхxcompetitorsdomainx.xx/&sa=U&ved=2ahUKEwiRrom1_bvrAhWC-2EKHb_bCA4QFjADegQIChAB&usg=AOvVaw3fAFoNHZxLmhzYj6nV3GQL

One more observation I have made is that have a link from a linkbuilding platform https://www.linkxхxxхxx.com/

Could you help me how this site is doing so well and how I can compete with them?