I migrated a forum website from a self hosted server to a cloud hosted solution and didn’t plan on a url change. The problem is, I had some httaccess rewrites in place that aren’t compatable with the URLs on the new cloud hosted site and unfortunately, I do not have access to an htaccess file to fix it and currently my inbounds from Google and others have fallen off a cliff

I have two pages:
mainpage.com and reservepage.com

I am trying to modify the URL structure of my client’s website. I am using add_rewrite_rule() function. But it does not get effected.