Auto Accident, New Bumper, Muffler, entire undercarriage half way under the SUV, 2013 Ford Escape. How much less would I be able to sell the vehicle for?

Tom & Jim, Thank you both so much for responding. But, I need a figure. The accident wasn't my fault. My brand new car w 10500 miles (I only had it 7 mths) was slammed into at 40 mph (I didn't claim any injury, if I was truly dishonest, I would have done that.). I'm an anxious person, so keeping the vehicle prob isn't an option. Sure they repaired it, but the worry wart in me says 40 mph slam, I'm going to have nothing but problems w this car now. In fact, the auto lift hatch is working intermittently. I did not file a claim with my insurance, only the individual who hit my vehicle. Diminished Value is available to me and I'm not missing this boat. Whether I sale it next week or two months from now or a year from now. Bottom line, a buyer looking at two identical vehicles (one being mine), for sale for the same price, the buyer will opt for the vehicle that has not been in an accident. I'm a consumer, I know I would and in fact I know I would never buy a vehicle that's been in an accident. "AutoCheck's" short ad video mentions 1, 2, 3 things, and 2 is "Accident". Immediately following the word "Accident", the spokesman says, "Is the Information Car Buyers Want The Most". My buyer pool is down to about 15% of the purchasers seeking that particular vehicle...eeeks. The claim is still open, the adjuster is low balling and offered $500. I'm thinking it should be $2,000-$4,000. Now I just need to substantiate that. If I could find a vehicle for sale with an "Unclean Title" (due to accident), I could see how much less a dealer is selling an accident auto for. My Escape has the Eco Boost engine, navigation system, panoramic sunroof, auto lift hatch, keypad/keyless entry, Platinum white and luggage rack (those are the extras).. CarGurus produced a market value of $22757, trade in value of $17361, and great deal price of $20,476. I need to substantiate to the adjuster my loss. If I can substantiate minimum $2500, then I can negotiate...and I'd be willing to accept the cost of a "Ford" "zero deductible" 7 year/100,000 mile extended warranty (runs about $1500). But then I would not have anxiety attacks every time something went wrong and I could keep the car. Oh boy I write a book. Sorry. I like this website. Glad I found it. I truly appreciate both your assistance. Thank You, Debbie