@RakibulIslamPrince I am not a site moderator for MSE, and don't have the "power" or means to unfreeze a chat room. Perhaps @DanielFischer, or @quid, or @davidlowryduda, or any other moderator can answer your question. I've pinged the three moderators I list above. Good luck!!
@RakibulIslamPrince Also, perhaps @AlexanderGruber, or @MichaelGreinecker, can help to unfreeze the chatroom you mention. It might be good for you to name the chatroom you want unfrozen.