Wp-admin 404 ERROR, unable to login

Within general settings I was changing my web address from https://thisisjosh.com/ihwp/ to https://thisisjosh.com/ihwp/home. Upon pressing ‘save changes’ I got a 500 error.

I tried deleting my .htaccess through ftp then got a 404. I even get a 404 when I go to login via /wp-admin. I feel as though I’ve made a huge mess. Any help would be appreciated.

Thanks