Value of the car has deteriorated after a no fault accident, what did you do for this similar case?

What you are talking about is diminished value. A car that was in an airbag deployed collision is worth less than the same car that was not damaged. Most insurance companies will resist paying for diminished value, you may need to get a lawyer to sue the person that hit you. You would need an appraisal from a dealer or automotive professional stating the difference between the value of your repaired vehicle and a comparable, non damaged vehicle.