Testing your website for how fast it loads or how good it’s SEO is can give you some indication of if your website needs work or not.
It its a good idea to periodically test your website using a few of the tools below.
https://www.dotcom-tools.com/website-speed-test.aspx
https://testmysite.thinkwithgoogle.com/
https://gtmetrix.com/?job_error=jafO5H9j
https://www.site-analyzer.com/
http://neilpatel.com/seo-analyzer/
http://www.seowebpageanalyzer.com/
https://www.seocentro.com/tools/seo/seo-analyzer.html
https://www.powermapper.com/products/sortsite/checks/seo-checks/
https://www.sslshopper.com/ssl-checker.html