Have you fixed your domain name with Google search console?
When you or any person search your site that is not showing www.domainname.com / domainname.com. It shows only once after setup your site.
If you do not fix this problem then Google feels this site owners are two person that means anyone duplicates from another. It's impact vary bad for ranking. When google feels site is one and owner is one that is best for search console.
This is called domain canonical problem.
This is very very important for a new or old site.
Generally after publishing your new or old site, this is not done because you don't know about this, but this is most essential for a site.
Now i am here to solve this problem within 48 hours.
And i will add your site in analytics tools in which you can see your site all information.
Before ordering please contact me i will give you best solution.