Home not editing anymore

Hi there

A 500 error is usually a server issue – I’d try quickly switching to one of the default WordPress themes, say twentyseventeen – and see if the problem still exists.

If it still does – I’d just get in touch with your hosting provider. There are other possible fixes suggested here: https://www.wpbeginner.com/wp-tutorials/how-to-fix-the-internal-server-error-in-wordpress/

Best

Simon