My website crashes on safari mobile

Hi everyone

I developed my first website with my own theme. Unfortunately, while it works perfectly on laptop, it crashes on mobile over and over again. Following different entries in this forum, I tried deinstalling and reinstalling plug-ins one by one, cleaning cache, removing all animations and background videos and complex elements like sliders. Unfortunately, I still don’t know what the cause of the problem is. As I am completely new to website development, I would really appreciate any help (in very simple language :))

Thank you

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