Obtaining +90 score of "Performances" metric in mobile section of google speed insights

Hello, I have a website under wordpress, and the task is about improving the score of "Performances" in mobile section of google speed insights. The actual score is 65 points and it need to be plus of 90 points. I'm using caching in server level with CDN of the hoster, with a default cache plugin installed by the hosting privider too. Note that you have to work with the actual structure and not use cloudflare for example, all things are working smoothly with the installed structure. All metrics are ok in desktop (google speed insights) and in mobile too, except the "performances" score in mobile that you need to fix. My budget for that task is 10 USD. Thank you.

Project ID: 40493198