Thank you for looking on this.
I have a Magento 2.1.8 website and it will run on the Amazon EC2 with this https://aws.amazon.com/marketplace/pp/B007OUYR4Y Amazon AMI.
I have optimized everything on Magento 2 website but did not get the proper result on this.
I have tried to use the Varnish cache but it is not working with the HTTPS.
anyone have an idea, how can use the varnish with the HTTPS to optimize the website speed.
Varnish Cache does dot speak HTTPS natively. You'll need an SSL terminator such as Hitch, HAProxy, etc. deployed in front of Varnish, ideally using the PROXY protocol.