This happens so many times, I tried with a different server, different themes, different developers and different ISP also
Please don’t upload your WP files and make them available. I’ve removed your post on that topic.
What do you mean by “crashed”? Viewing your site, I see multiple “500” errors.
Errors like this are logged. Check the error log on your server. If you can’t find the log, please contact your host.
Meantime, enable wp_debug and wp_debug_log and after an error, look at wp-content/debug.log to see if anything gets logged there. https://ww.wp.xz.cn/support/article/debugging-in-wordpress/
You can also try this: Please attempt to disable all plugins, and use one of the default (Twenty*) themes. If the problem goes away, enable them one by one to identify the source of your troubles.
If you cannot access wp-admin, there are other ways to deactivate plugins.
