How to conduct SEO Audit of website to get more accurate results?

I want to analyze and to get the worth of this website > https://www.cpstest.us/

My concern is to evaluate this site for earning potential as well as to analyze which tool is a better performer. As there are 11 tools available on this website. I want to start with the most useful tool to build a website like this one. unfortunately, I’m not an SEO expert and don’t know which tool is providing accurate results. I tried many online websites in order to get the desired result. But these results are far more different from each other which making me more confused. If anyone can help in this regard that would be highly appreciated. Thanks in Anticipation