Apex domains cannot have CNAME records.
Question and response
Question
dig ns2.highlevelmarketing.net. NS
Answer
ns2.highlevelmarketing.net. 5 NS ns2.highlevelmarketing.net.
ns2.highlevelmarketing.net. 5 NS ns3.highlevelmarketing.net.
ns2.highlevelmarketing.net. 5 NS ns4.highlevelmarketing.net.
Authority
The response has no authority records.
Additional
ns2.highlevelmarketing.net. 5 A 20.163.13.191
ns3.highlevelmarketing.net. 5 A 20.29.59.26
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0