Thank you. Do you think this plugin is good?A balance of WP Rocket and Perfmatters (for unused css and other benefits), and the use of a decent page builder i.e Oxygen or Bricks gives you some amazing results.
Not forgetting optimisation of images (without any use of plugins) by using https://squoosh.app/ and opting for a minimum of 10 to 15 plugins max, all checked by https://wphive.com/ for their speed, security and more, helps with overhaul optimisation and security
This can also be a cause of your hosting company. Try and avoid shared hosting, and if you cannot for cost purposes, use a WP hosting package for the benefit of PHP memory, security, backup and more. All sites on these platforms are using the same CMS and helps reduce issues with security and much better support, especially for clients etc.
There is more you can do to help but never always rely on Google or GT Metrix for their accuracy and honesty. If you build a site with speed and optimisation in mind you should be fine.
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