How did you determined that it is SEO friendly ?
Have you submited sitemap in Google webmasters tools and everything is ok (no notifications at all)?
Have you 100% score of Google pageSpeed ?
Do you use properly microdata?
Do you use properly breadcrumbs?
Is your site html5 compatible (main , header , footer) ?
Do you have a mobile version in same URL's (or is it even at least what is called “responsive”) ? What pageSpeed analysis says about your mobile experience (not the speed only (that is the first one) but also the experience) ?
I could make 100 more questions , but lets start with those