Get Grade-A GTmetrix Shopify

My Shopify homepage must reach a solid Grade A on both mobile and desktop when tested on GTmetrix. Right now the site lags behind because of slow loading times and some unrefined JavaScript and Liquid snippets... (Budget: €8 - €30 EUR, Jobs: CSS, Frontend Development, GTmetrix, HTML, JavaScript, PHP, SEO, Shopify, Web Development, Website Optimization)