Magento 2 website speed very slow as per https://developers.google.com/speed/pagespeed/insights/
Result of site:-
Reduce server response times (TTFB) - 1.68 s
We already enabled minify js, merge js, minify css and merge css from backend. Also, HTTP2 protocol used to send all request. We use built in cache in production mode.
We do not use Bundling because its create almost 7.5 MB file so takes more time to load resources.
Please help me to improve page speed around 85/100 for desktop at-least.