I wanted to delete the domain (since basic plan won’t allow you to change DNS) and have been trying to reuse same domain at a different site but domain is still active.
Is that khanbridgeconsulting.com? I see that was purchased from Cloudflare Registrar. CF Registrar domains need to use Cloudflare nameservers.
On any plan, you can add and change DNS records.
I suspect you’ll need to add the domain back to your cloudflare account and then transfer it to a different registrar if you wan to use non-cloudflare nameservers.
Unfortunately, you’ll need to wait a bit of time to transfer it due to ICANN rules. Specifically, The domain(s) must have been registered for at least 60 days and in unlock status.