I contacted my domain provider, and they told me to change my CNAME to _acme-challenge.raoulk.com, however, Cloudflare automatically sets it to just _acme-challenge
What can I do to set up the name servers probably and get my site online again?
_acme-challenge.raoulk.com. 241 IN CNAME raoulk.com.acme.service.one.com.
raoulk.com.acme.service.one.com. 241 IN CNAME raoulk.com.acme-cust-transient.one.com.
ftp, sftp and ssh will need to be set to “DNS only” as well if you use those services since Cloudflare only proxies HTTP/HTTPS traffic.