Performance and Site Optimizations

Hello,
In our site we are facing Slow page loading and site performance on https://gtmetrix.com is not so good as Page is loading on 8-9 seconds with page request 132.

We have added Wp-rocket but not getting any speed improvement.

Currently we are facing the following issues With Yslow Score-61%
1)Make fewer HTTP requests
2)Add Expires headers
3) Use cookie-free domains
4)Reduce the number of DOM elements.

Also Page Speed Score-58%
1)Serve scaled images
2)Optimize images
3)Defer parsing of JavaScript
4)Avoid bad requests
5)Leverage browser caching

How to improve the Overall Page Score?

Thanks,
Dwaipayan

The page I need help with: [log in to see the link]