A Full Guide To Cloudflare

The steps that I carried out to make it work were the following

  1. Follow the steps carried out in:
    How to add your own domain to your account - Docs - InfinityFree Forum

2.- The steps mentioned above are correct, each and every one of them

In one of the hosting support post I remember reading that, despite the fact that it is configured in that way (even if it is the correct one), the hosting servers simply would not know how to redirect the requested traffic, because they do not know to what account The domain is linked so it redirects to https://suspended-website.com/(letras)/, then do the previous steps that I mention and then those of this post.