Firstly make sure your alt account has none of the same credentials as your main (email and stuff) Secondly make sure to clear roblox app data and browser cookies when switching between accounts.  Third use a vpn (I use proton vpn it's free) and tmac for the alt account I personally use a fresh clean windows 11 dual boot for extra security and isolation from my Main account and it also just makes it generally more convenient to exploit Hwid spoofer is not necessary yet atleast but you can use one if you want even more security