Javascript Wizard Required

Just to give you some background, I’ve been having some issues with this site, Skinega.com. Initially there were speed issues which were mainly fixed by WP Rocket. However, on the mobile version, it’s still super slow, and also the burger menu is now not working on the mobile home screen (but does work on the other pages). Someone without the depth of javascript experience has tried to fix it before, but for every fix, other things break. So you will have to be a superstar javascript person. On this page.......[login to view URL] On this page, there seems to be a speed issue. I suspect its because it’s loading all the reviews (176) all at once. To solve this, I’d like you to make the word “REVIEWS” (beside the yellow starts) and the line “176 REVIEWS FOR VEGAN HYALURONIC ACID” open up the reviews below, so the reviews aren’t just all loading automatically and slowing the page down. In other words, someone has to come to that page, and they have to click on "REVIEWS" or "176 REVIEWS......" in order for the reviews to be visible. Also there seems to be a CSS issue where the reviews are appearing as replies to other reviews and therefore there’s big lines appearing as you scroll through the reviews. The burger menu on home screen for mobile isn’t working. I’ve had javascript issues before, and I’m hoping an expert in javascript can look at the site and the pages and just see and fix what issues there are, including the burger menu in mobile not working. I want the WP Rocket functionality to remain – I don’t want to simply turn off the minify JS files and so on as it does so much to keep the website fast. So I really need someone who can look at the pages, look at the javascript, identify the issues and fix them without having to compromise on site speed. If you also see other issues affecting speed, it would be great to bring these to my attention and we can discuss a seperate cost for fixing those too.