GTmetrix A Upgrade for Realty Site

My real-estate website is stuck at an E on GTmetrix, with both performance metrics and Core Web Vitals deep in the red. I need it lifted to a solid A and green across the board without disturbing day-to-day operations... (Budget: €30 - €250 EUR, Jobs: Database Management, JavaScript, MySQL, Performance Tuning, PHP, Web Application Audit, Web Design, Web Development, Website Optimization, WordPress)