Fully Optimize Wordpress Website and Server VPS

Job ID: 35801453

Budget: ₹1,500 – ₹12,500 INR

I have a eCommerce website, I have recently purchased VPS from Bluehost for that single domain and even Pro plan on Cloudflare to improve performance however the performance is not upto the mark. GTmetrix ratings are 'E' & 'F' without Cloudflare, sometimes 'D' when there is no traffic. I only get 5-10K pageviews everyday and around 1k visitors so technically I'm overspending on the server but yet there seems to be a problem with on-page optimization and also server level optimization. During high-traffic times (when many users are parellel) the website becomes terribly slow and affects our sales drastically.

I need an fully qualified person, not just a Wordpress expert but a experienced developer who can understand the issue in detail and help me resolve this in detail. I have tried all common troubleshooting, so don't want anyone who is planning to fix this with common troubleshooting issues, please be very informed. Just need developers who are expert at optimizations and can work in-depth who can optimize VPS server and fix the DOM-size issues manually.