How to increase God’s fire in a place ? You can increase it by saying “ Fire” repeatedly followed by “ of God in this place in the name of Jesus Christ.
Another way is by saying “ I spew the fire of God” after having already call the fire of God in a place.
Example “ Fire of God in this house in the name of Jesus ” followed by “ I spew the fire of God into this fire in the name of Jesus Christ.”
This will put your fire stronger and help push and keep away evil spirits.