I’m not sure if I created already an topic for that but I’m creating now a topic for that
https://seositecheckup.com this is a very good SEO-Website you can get there informations how you can fix SEO issues of your website, this helped me.
https://www.woorank.com you can check here to your website.
This is not a SEO-Website https://www.worthofweb.com/website-value/ but you can there calculate the worth of your website, I tested many websites to calculate the worth of my website and this here comes very near to the estimated visitors and other factors, try it out.
If you knows other Website checking SEO please post it to the topic