Message Cyrus(an admin) and send him/her proof that you're actually the owner of the account, by signing a message through the bitcoin wallet address registered on your stolen account.
I never thought that we could still recover our account if in case it got stolen. Thanks for this.
You can. It's just that it's probably going to take a few weeks before you get a reply, due to bitcointalk having so much members and the admins being probably really busy.