Improving WordPress site speed not only helps SEO, especially with Core Web Vitals becoming a direct ranking factor next year, but improves UX/UI for more conversions across channels.
- Caching plugin
- Image Optimization plugin
- Content Delivery Network (CDN)
Tinker with the settings for each tool. For example, you may want to preload fonts in WP Rocket, or modify the image compression level within Imagify. Check if your CDN can use HTTP/2.
Finally, all of this is for naught with a poor, cheap server!
For instance, you may have a plugin for embedded reviews that loads on all pages. Since you may need to only load these resources on your Testimonials page, you can disable it on all other pages to boost their speed.