what should I do to unlock the account?
In order for your account to get unbanned, you need to appeal in the given link. But it will take some time before you get your account back.
I don't know if it's a temporary or permanently ban but if this is the first time your account get banned, then I think it's just temporary.
Edit. By looking at your post history, the reason why your account get banned is too obvious
No one has ever been heard back from that mail if I am not mistaken. The appeal thread is much better.
OP, you're permabanned/ banned indefinitely. No coming back, no creating alt accounts, none whatsoever. And the fault is all yours, you didn't read/comply with the rules, you pay the price. Sorry OP, but bid goodbye to this forum and to bounties. And stop ban evading. You're still breaking the rules.