The above optimization link suggests caching and using a CDN. Here are two quick and easy optimization actions you may want to take immediately:
Quick Fix 1)
I can see your hosting server uses the LiteSpeed webserver, and you already have the LiteSpeed Cache plugin installed. But you’ve not configured the plugin to cache your site’s pages.
I suggest enabling full-page caching and properly confining other aspects of the LiteSpeed Cache plugin you’ve already installed, so the plugin can serve the intended purpose.
If you need help configuring the LiteSpeed Cache plugin, there’s a dedicated support forum where you can get help from its developers and support community here: https://www.ads-software.com/support/plugin/litespeed-cache/
Quick Fix 2)
I can also see you’re using Cloudflare, but you’re not caching your site’s content at Cloudflare’s edge servers.
By default, Cloudflare caches only site assets like images, CSS, and JavaScript files — but not full HTML pages. You need to specifically create a Rule to let Cloudflare cache your site’s pages. There are also additional content optimization features that you may want to enable/tweak in your Cloudflare dashboard.
You may use Cloudflare’s Automatic Platform Optimization (paid) plugin or any of the 3rd-party Cloudflare plugins to automatically optimize your Cloudflare settings if you’re unable to handle this yourself manually.
If you need help configuring your Cloudflare CDN, head over to their community forum here: https://community.cloudflare.com/
Good luck!