This message is a call to sing again after great troubles and discouragement. Or in different words it is a command to hope again in was lost. Israel had turned away from God and pursued their own dreams without God. Life imploded on them and they lost everything. Now thru God’s help he delivered them from their slavery and was commanding them to sing again for he would restore what they lost due to their sin.
The primary focus is the promise of God to provide supernatural growth of a spiritual family, renewal of his steadfast love to them as their husband, and a beautiful secure home with God as the Father.
All that is from God himself but he does call them to sing again, prepare for growth, and not fear!