Itheme Security Plugin – WP-CONTENT – broken website

Hi,
I’m using the Itheme Security plugin and I wanted to change the WP-CONTENT prefix to a personalised one and it crashed my entire website. All I can see now is a blank page. When I log in to my wordpress back office, everything is gone, I have no plugins, no images, no contents.

I tried to change manually the name back to wp-content from my htdocs files on hosting provider but still does not work.

The website is https://www.espaceterroirs.com

How can I fix it?

Please help!!!