I know its a different car but a few years ago I was selling an Astra coupe turbo. unfortunately I had to get diesel due to a new job with lots of travelling.
I had owned the car since nearly new, it had full service history and records for everything from new, oil and filter had been done every 4k in my possession, the car was in the best colour europa blue, the car was standard unmodified and most of all was absolutely immaculate inside and out around 3 very small stone chips on the bonnet.
The car was also mechanically perfect and always had been driven with mechanical sympathy.
I could not sell the car at all but i kept dropping the price every week until it did in the end I let it go for £1900
only one person even come to see it and they bought it straight away and give me the full advertised price.
But a car is only worth what someone will pay so you need to keep reducing the car until it sells otherwise it will just lose even more and more money.
Please dont make a comparison of the GT to an astra coupe
I know what is better looking......GT