I have upgraded my account with paid version of infinityfree in ifastnet for a month. But after a month I changed the nameservers back to infinityfree but I have faced the account suspension page.
I changed the name servers 3 times but It reflected in dns but doesn’t show the website.
It seems that the domain name is still linked to a premium server IP. If you want to move it back to free hosting, please contact iFastNet so they can link your domain to your free hosting account again.