white page after changing site url

Hi, I just changed the “site url” on the admin-options and now on the site url I can only see a blank page. I can access the admin are on the “wordpress url” I did the change or url as I’ve allways do with the sites I’ve done. I copyed the .htaccess and the index.php to the root folder an changed the path :
require(‘./wp-blog-header.php’) to require (‘./mysite/wp-blog-header.php’) mysite is the name of the wordpress folder.

As far as I can tell everything is fine but I can’t see the site.

I’ve also asked my hosting service provider to set the memory_limit variable to 128 because maybe that could be the problem.

I’m running out of otions! Can somebody tell me what else could be causing this problem? besides de memroy limit?

Please help me!! the site url https://ivettvillarreal.mx and the wp url is https://ivettvillarreal.mx/mysite

Thanks in advance! and… Saludos from México!