When I attempt to dig the CNAME that should be added at your DNS provider I do not get the expected response as detailed in the Cloudflare Dashboard, it therefore appears that the CNAME records are not correctly set up at your DNS provider which appears to have the NS servers of : ns1.dns-parking.com. dns.hostinger.com.
Please verify that the CNAME records have been set up at Hostinger
In the results below I have removed the actual verification string and replaced it with
@rafaelfre let us know once you have changed your nameservers as advised on 2714814. Keep the communication on that ticket as your earlier ticket has been merged into that one. Duplicate tickets slow reply time.