Step 1: First, Optimize your Server and the System Requirements
Step 2: Update your Magento 2 to the latest version of Magento 2
Step 3: Enable Varnish Cache to your website
Step 4: Configure the Memcached
Step 5: Enable the Flat Categories and Flat Products
Step 6: Optimize your website's Javascript and CSS
Step 7: Setup CDN (Content Delivery Network)
Step 8: Use a good theme for your e-Commerce store
Step 9: Choose suitable and worthy Extensions
Step 10: Optimize the Images of your website