please don’t write emails AND use the support forum, please use only one of these things!
We tried it on your website with only one plugin, we deactivated the Yoast SEO plugin and it was working without any problem.
Most of my sites have this amount of plugins, even many more on the same server. Never have a problem with memory
Not every plugin cause the same memory usage, it’s always up to the plugins you use. But trust me, we know the problem from other clients, it’s always the memory limit.