Twitch bans users based on their account ID and their IP address. Even if you make a new account, chances are your IP address will remain the same, so you’ll still be banned.
You can change your IP address with a VPN. Just connect to a server when you make a new account. You’ll also have to stream while connected to the VPN so your old IP address isn’t exposed.
Twitch can ban you from broadcasting, watching videos, and chatting. Check out Twitch’s website for more info on appealing bans.