It is clear that you grasped the meaning of the dream and the application thereof as well. Vehicles parked in a garage (at home) have a bad meaning: It means the people or person involved’s ministries are paused. Vehicles in a parking area have a slightly better meaning (not paused but not really active)
Positive meanings of vehicles in dreams are vehicles busy working and people busy driving vehicles in streets and roads.
It appears that in your dream many people were in a situation where they did not really add something positive to the church or the body of Christ, or being active in ministry (almost dormant).