Website speed

I have build my website using the Vogue child theme and it isn’t loading the pages quickly. I have followed almost all steps listed on the WP Engine site (such as deleting unused plugins and themes), used imagify to optimize all images/videos, and purchased WP Rocket. The site also ranks low on Google’s speed check – WP Rocket improved it but only slightly. The pages are still loading slow so I wonder whether it’s the theme itself. Any advise on how I can speed the website up without having to change the theme?

The page I need help with: [log in to see the link]