Hi @ahmedkaludi your plugin is really great. I got scores until 95 than my desktop page.
However, I got the same issue. In my case, the google insight response is
None of the final above-the-fold content could be rendered even with the full HTML response.
I tried to check the HTML sources and look at the great code which you optimized them.
However, I found big CSS inline on the head tag. I know it make the page crazy fast but I found the reference from google here Reduce the size of the above-the-fold content
Load the main content of your page first. Structure your page so the initial response from your server sends the data necessary to render the critical part of the page immediately and defer the rest. This may mean that you must split your CSS into two parts: an inline part that is responsible for styling the ATF portion of the content, and the part that can be deferred.
I don’t know what’s the real problem. Hopefully, the reference could help. Thanks for the great plugins. Cheers