Total car loss, financing not yet completed, no full insurance, what to do?

Seven days ago I signed a new loan agreement because I still have a debt (about €8,000) unpaid on my car. I had the option of returning the car to the dealer, paying the balance or continuing to finance it. I decided to continue funding. Two days ago my wife had an accident with her car and it was her fault. Luckily nothing happened to her. Unfortunately, the car is a total economic loss (repair costs around €10,000). The stupid thing is that I only have partial insurance. It is clear to me that I will be involved in costs. The right of cancellation for the loan agreement is 14 days. What can I do now to reduce costs?