Hi mate,

GT Metrix update recently and change their Functionality
we are currently working on it to increase the demo rate
( all theme in ThemeForest has this issue )

However, we highly recommend you to use
a plugin for chase we suggested you autoptimize or W3C total cache :

Autoptimize

Or

W3 Total Cache

And you make sure all your images are optimized we suggested you use smush or ewww image optimizer plugins :

EWWW Image Optimizer

Smush Image Optimization – Optimize Images | Compress & Lazy Load Images | Convert WebP & AVIF | Image CDN

and also use CDN
we also enable cloudFlare CDN on our Website

Regards