If you want to delegate your domain to other name servers, then the domain must be transferred out of Cloudflare first.
6.1 Nameservers. Registrant agrees to use Cloudflare’s nameservers. REGISTRANT ACKNOWLEDGES AND AGREES THAT IT MAY NOT CHANGE THE NAMESERVERS ON THE REGISTRAR SERVICES, AND THAT IT MUST TRANSFER TO A THIRD PARTY REGISTRAR IF IT WISHES TO CHANGE NAMESERVERS.
7.2 nameservers
Registrant agrees to use Cloudflare’s nameservers. REGISTRANT ACKNOWLEDGES AND AGREES THAT IT MAY NOT CHANGE THE NAMESERVERS ON THE REGISTRAR SERVICES, AND THAT IT MUST TRANSFER TO A THIRD PARTY REGISTRAR IF IT WISHES TO CHANGE NAMESERVERS.
You will need to obtain the relevant DNS record(s) (typically such as AAAA, A or CNAME) from Campfire.bio.
DNS records can be added/modified/deleted over here:
That way, you can continue with using Cloudflare for your website.
You will need to contact Campfire.bio.
Campfire.bio is the only party, that are able to supply you with the correct DNS record(s), in order to point your domain name(s) towards their infrastructure.