Website not referenced in search engines

Hello !

I’ve used the Child Theme for one year and Pure&Simple theme for 3 months.

With both theme, I’ve noticed that there’s a problem in referencing the website in google and all the others search engines.

I’ve added in a google analytic account both “www” and withtout “www” link, and there’s no error found in the pannel, yet it’s been 3 months nothing seems to change.

Does anyone have the same problem ? and/or have an idea how to resolve it ?

Thank you for your time !
Quentin