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.
Thanks

I have recently used WP Rocket and it worked nicely for my website. https://bit.ly/3aiwOhC
Just saw the youtube video BY WP Beginner, and that made it easy for me to optimize my website speed.