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You can enable debugging to identify any specific errors. Use an FTP client or your hosting control panel to access your WordPress files. For full guidance and step-by-step instructions on enabling the debug log, refer to the WordPress developer documentation: Debugging in WordPress.  

A common cause for errors is a problematic plugin, so you can temporarily disable all plugins. If that resolves the issue, enable them one by one to identify the conflicting one.

Your theme could also be causing a conflict. Try switching to a default WordPress theme (like Twenty Twenty-One) to see if that helps. You can rename your active theme’s folder to “theme_old” to revert to a default theme.