Servers track more than just your IP. NordVPN wont work because most servers block VPNs, so you either need to change your IP through your ISP or get a residental proxy (MysteriumVPN).
There is no particular order you need to do. Clean your Steam files, create or buy a new account and before you join the server you will need to hide your real IP. It doesnt matter for Steam what IP you got.
Also make sure to have a different username and at best not a new steam account with 0.5 hours playtime. And of course a good and undetected cheat like
http://proofcore.io/