To resolve a 404 error in WordPress, you can try the following steps:
Check the permalink settings: Go to the WordPress Dashboard > Settings > Permalinks and make sure you have the correct permalink structure selected.
Refresh your website’s permalinks: Go to the WordPress Dashboard > Settings > Permalinks, change the permalink structure to a different option, save changes, then change it back and save changes again.
Check if your .htaccess file is causing the problem: You can temporarily rename the .htaccess file in the root directory of your WordPress site and see if this fixes the error.
Check for any broken links: Use a tool like Screaming Frog SEO Spider or Broken Link Checker to identify any broken links on your site that could be causing the 404 error.
Create a custom 404 error page: You can create a custom 404 error page in WordPress by creating a template in your theme and redirecting 404 errors to it.
More details can be found at WordPress 403 Errors page
If these steps do not work, you may need to contact your hosting provider for further assistance.