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Your .htaccess file seems to be irrelevant.

A page with a 500 Internal Server Error would be a PHP fatal error in disguise. Most likely it's an issue with a third party plugin or extensions since we are of course using Admin Tools 5.3.4 and Joomla 3.9.12 on all of our production sites without any problems :)

First, check your server's error logs (not the access logs) immediately after visiting the page which throws the error. There should be an exact description of the PHP fatal error which occurred. Sometimes you can find the error messages in files called error_log or error.log inside the site's root and/or administrator directories. If unsure about the error log location, please consult your host. Most likely the error logs are available in your site's hosting control panel.

If your host does not give you access to the error logs and you have access to the Joomla! administrator area, please log in to your site's back-end, go to Global Configuration, click on the Server tab and set the Error Reporting to Development. Try visiting the problem page again.

If you still get a blank page, edit your configuration.php file and put the following code right after the final closing curly brace ( this is what a curly brace looks like --> } ) but before the closing PHP tag (it looks like ?> that is a question mark and a greater-than sign):

ini_set( 'display_errors', true );
error_reporting( E_ALL ); 

Try visiting the problem page again.

If you still get a white page, please remove the two lines from your configuration.php file. Edit the .htaccess file in your site's root. Add the following to the end of the file:

php_flag display_errors On
php_value error_reporting 32767

and retry loading the problem page.

If you still get a white page, remove the two lines from your .htaccess file. Now, create a file called php.ini with the following content:

display_errors=on
error_reporting=E_ALL

and upload it into your site's root and your site's administrator directory. Retry loading the problem page.

If that fails again, remove the php.ini file and create a file named .user.ini (note that it's dot user dot ini, the leading dot is important) with the contents:

display_errors=on
error_reporting=E_ALL

and upload it into your site's root and your site's administrator directory. Wait for 10 minutes. Waiting is important, .user.ini files do not apply immediately. Retry loading the problem page.

IMPORTANT: Sometimes the error won't show. Edit your configuration.php and find the line starting with public $error_reporting and set it to:

public $error_reporting = 'development';

This instructs Joomla! to enable maximum error, warnings and notices verbosity. In 99.9% of cases it will result in the error messages being shown on the browser.

If you still get a white page, delete the php.ini or .user.ini file your created and consult your host. They have to provide you the PHP error message, file and line it occurs (along with the error's backtrace) themselves.

Please note that if you can not understand what the PHP error message means, just copy and paste it here verbatim so that we can take a look and point you to the right direction.

You're welcome! I'm glad everything is working fine now :)