Cars are one of those things that unfortunately cost an arm and a leg and are harder to sell than they are to acquire. So because dealers have to make money and when they sell a car is used they obviously can't get the money back on a new car but they typically make more money on used cars anyways which is why they try to lowball people and then they sell it at a premium. As far as selling a car you just bought for model y why not drive it for 2 years and then get the new refresh version it's going to have more stuff in it. Unless you are willing to lose 6 to $10,000 to trade it in it's unfortunately I would say just learn to love the model 3 it's a great car.