Cars Q&A

I am thinking to buy new car because my existing car will be scraped in next 4yrs. Im 2nd owner and purchased swift zxi before 1.5yr in 2.10L. I invested 30k in repairing. current running 1Lakh. I am thinking below 3 options. 1. Exchange with new car in showroom by selling at 1.4L plus Exchange bonus 30K 2. Apply CNG kit and use as max as i can 3. Sell at 2L on Olx Please suggest, Im not sure what is best.