Need Expert on Google Pagespeed for a wordPress website

I need someone expert in Page speed optimisation for Help us on a complete Page speed optimisation for a wordpress website.

We are looking for someone who can Reduce unused stylesheet rules and defer unused CSS resources to above-the-fold content to reduce the amount of bytes consumed by network activity. Learn how to reduce unused CSS resources.FCPLCP
WordPress
You may want to consider reducing the number of WordPress plugins that load unused CSS into your page, or disable some of these plugins. To determine which plugins are adding unnecessary CSS, run code coverage in Chrome DevTools. You can identify the responsible theme or plugin from the stylesheet URL. Look for plugins that have a lot of stylesheets that have a lot of red elements in the code coverage. A plugin should only enqueue a stylesheet if it is actually used in the page.
WP Rocket
To resolve this issue, enable the Remove Unused CSS option in WP Rocket. This option reduces page size by removing all unused CSS and style sheets and retains only the CSS used for each page.

And make global optimisation on a Wordpress custom website.