Problem with error 500 | WordPress.org

Yesterday I tried to edit my website. When i finished everything and wanted to update changes in elementor, error 500 appeared there and I couldn’t update my page. Today i tried to solve this problem searching for it in internet . I tried to switch off plugins or add the php memory but nothing worked. Then when i tried to make a change in elementor one more, my page completely messed up and it looks like two weeks ago when i didn’t make any changes. I can’t restore previous versions of the website even though they are saved. Now when i want to edit my page i see this error :Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 20480 bytes). Please help me, i am amateur and i don’t know hopw to manage with this problem. I am scared that i lost my page at all.

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

 

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