Improve speed on WP Website on GT Metrix

I have a website build on WP using bluehost shared server i have enable cloudflare though bluehost also i am using WP Rocket paid version .

I have on GT Metrix score on different countries that i want to improve for example :

Vancouver, Canada : Fully Loaded Time: 1.2s GRADE A
Hong Kong, China : Fully Loaded Time: 2.7s GRADE A
London, UK : Fully Loaded Time: 2.1s GRADE A
Mumbai, India : Fully Loaded Time: 3.9s GRADE C
San Antonio, TX, USA : Fully Loaded Time: 2.6s GRADE B
Sydney, Australia : Fully Loaded Time: 2.0s GRADE A
São Paulo, Brazil : Fully Loaded Time: 6.0s GRADE D


I want someone who know already what to do to improve my website to do it as light as we can so it can load even faster on all countries .

Check screen for GT Metrix scan : https://prnt.sc/tcRNrTM2-uhy