My question is if i can register new account post freely on the forum?
It would appear you still haven't read the rules:
25. Ban evasion (using or creating accounts while one of your accounts is banned) is not allowed.[e]
Which is explained in a bit more detail in the examples section a bit further down that post:
25. If you get banned (temporarily or permanently) and create a new account to continue posting / sending PMs, it's considered ban evasion. The only exception is creating a thread in Meta about your ban.