God is asking His Church to come out of mourning, out of that place of desolation or confusion and come into a dance with Him.
I am reminded of King David when he danced before God and the people were insulted because it was not the right behavior for a king.
God is saying to be like David, let go of your mourning, and dance with me. Some people will say, how can you be dancing? How can you be rejoicing? How can you be thanking God after all we have been through?
But there is a breakthrough for us and through us that will pour out to the rest of the world; believers and unbelievers. We will wrap the joy of the Lord around them when we dance.