500 server error

I am a new wordpress user and recently I added weglot multilingual support to my website. I wanted to have English as my default URL so I foolishly try to change the site address URL and wordpress address URL at Settings->General to https://visitaguidatamonaco.com/en, which started the problem, I was not able to access wordpress itself. then I changed the WordPress address URL and site address url in the database wp_options table. Now I am able to access WordPress but my other pages or the URL generated by weglot to support multilingual stuff like https://visitaguidatamonaco.com/en/servizi/ is not loading now and giving below error:

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at [no address given] to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

Apache/2.4.41 Server at visitaguidatamonaco.com Port 443

And when I checked respective pages, it shows below error for wp-asset-clean-up: css and javascript manager plugin.

Note: The checked URL returned an error when fetching the assets via AJAX call. This could be because of a firewall that is blocking the AJAX call, a redirect loop or an error in the script that is retrieving the output which could be due to an incompatibility between the plugin and the WordPress setup you are using.

Here is the response from the call:

Status Code Error: 500 * for more information about client and server errors, check this link
Suggestion: Select “WP Remote Post” as a method of retrieving the assets from the “Settings” page. If that doesn’t fix the issue, just use “Manage in Front-end” option which should always work and submit a ticket about your problem.
Output:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at [no address given] to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

Apache/2.4.41 Server at visitaguidatamonaco.com Port 443

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