I have messed up my wordpress site

the long and short of it is I changed site url and wordpress url in genneral settings it didn’t show ‘ ‘www’ firstly is that normal?? anyway i changed it and gone downhill from there. (reason i did that was there was an issue with SSL Cert which still has to be resolved.

I was locked out of my admin, login page looked wrong, like like an older version of a log in page. anyway I eventually got back in to admin, I turnoved off all plugins and themes and tried to find out issue.
I used below and added it to
define(‘WP_HOME’,’https://example.com’);
define(‘WP_SITEURL’,’https://example.com’);
on ftp ‘wp-config.php’

I can’t see my themes just white space, I can’t add any themes, something is missing….. absolute novice and my only help is here. appreciate any help at all.

The page I need help with: [log in to see the link]