Need Suggestions about the best speed optimizer?

Hello, everyone I hope you have a fine day I am working on a site that is courier related. in its development speed is of the essence but I am troubled with it the gt metrix suggests the speed of site goes on with 5 seconds which is a terrible news for me the site is hosted over wordpress I was looking for a suggestion for speed plugins and hosting for sure.

I have recently used WP Rocket and it worked nicely for my website.
Just saw the youtube video BY WP Beginner, and that made it easy for me to optimize my website speed.