Critical Error on your website

Try manually resetting your plugins (no Dashboard access required). If that resolves the issue, reactivate each one individually until you find the cause.

If that does not resolve the issue, access your server via SFTP or FTP, or a file manager in your hosting account’s control panel (consult your hosting provider’s documentation for specifics on these), navigate to /wp-content/themes/ and rename the directory of your currently active theme. This will force the default theme to activate and hopefully rule-out a theme-specific issue (theme functions can interfere like plugins).

You may want to use File Manager (or its equivalent on your hosting panel) to change the name of each plugin folder under /wp-content -> /plugins.
That will disable them and should allow you to regain access to your site.
You can then re-enable them one by one (by changing the name back to what it was, so don’t change it to anything complicated, just add a 1 at the end or similar) to find out which one is causing the problem.