Change NS IP Address

I am still confused, please help me... 
Please give me information, what are the things that must be edited if we change the Name Server IP address (NS1 SubDomain & NS2 SubDomain)?

Previous NS IP Address or my VPS IP Address is 198.XXX.XX.217, then I change into 104.XXX.XX.214

Changes I've done in the CWP is:
Edit Nameservers
List DNS Zone -> Edit all Records -> Reload all Zones
Restart BIND DNS Server
Reboot VPS

Until this moment, the new IP Address is not directed/pointed to my domain / NS. 
Whether to wait for the process of propagation? yet up to 24 hours, until now approximately only 20 hours.
Kindly advice and assistance. Thanks 

Hello.

Have you maybe changed the NS in a domain registrar panel?
If yes, you have to wait 12-72 hours.