Wp critical error

This article lists several completely different ways to reset your password. Any one of them will work and do the job. Find the one that’s right for you and use that: https://wordpress.org/support/article/resetting-your-password/

Look at the PHPMYADMIN methods of plugging a new password into the database.

With respect to the critical error, 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://wordpress.org/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:  https://wordpress.org/support/article/faq-troubleshooting/#how-to-deactivate-all-plugins-when-not-able-to-access-the-administrative-menus