I have read your requirements, i am an experienced Wordpress developer and expert Wordpress website speed optimization, I can get score of 85+ to 90 btw with average loading time of 3s to 2s on gtmetrix or google page speed insights or pingdom tool,
How we will increase speed-
* We will check current speed through google speed optimization and follow process and improve speed.
* remove render blocking css and jaavscript
* optimise css and images
* compress css internal
I will audit your website theme, plugins, and hosting. Fix code issues, suggest best affordable hosting (if needed) and flawlessly migrate your website.
please feel free to contact me anytime, quality work is granted.
Thanks,
Rustam Ali