Thank you for all the debug information.
I suspect you upgraded to WordPress 5.5 and now it doesn’t work anymore?
I would assume there is a plugin or theme that is using old code that is not compatible with the current jQuery in WordPress.
You can install this plugin to add compatibility for old jQuery code:
Please be aware that you do need to really fix things, in WordPress 5.6 there will be more changes and it will break again.
You will want to make sure all your plugins and theme are updated to the latest version. Also check of all your plugins and theme are still maintained and have seen a recent update.
Can you share the address of the website? Then I can take a look.