As I have a lot experience with JavaScript, HTML, CSS and also how Google see your website structure, I'll be able to fix this in less than one day.
Relevant Skills and Experience
I work for 5 years with javascript, css and html. In all the projects that I develop, I worked as a fullstack developer, as you can see in my profile.
Proposed Milestones
$15 USD - Fix render-blocking JS
$10 USD - Set priorities for Google.