I have checked your site speed score and here is the results: https://postimg.cc/QV6fbTzK as you can see it stands in D grade with a load time “5.4s” then I checked the reason for it and found that there is only 1 that is “server response time”
All the rest are ok you have maintained very well. But for the server response time as you can see in the above screenshot it also, suggests you to use the WP Rocket plugin. You can install this plugin from the XSTORE >> Plugin Installer and configure it to solve your issue. But I suggest you while using this plugin try to avoid using other cache and optimizer third-party and hosting plugins.
Further, here is an article from our theme to understand how the WP Rocket plugin helps and works: https://xstore.helpscoutdocs.com/article/128-how-to-improve-wp-rocket-settings-with-xstore
Hope this helps.
Regards 8Themes Team.
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