Just keep the current car and drive it for several more years. You owe to much to trade it in. The dealer if they would even help you would have to put the difference of what you still owe and what the car is worth onto your next car which would make you that far upside down in debt.
Many people get hurt trying to keep trading up on cars to the point that the current car they last traded for is now only half of the debt that they are paying in the cars payments, just to keep the car. Totally not worth the trouble.