I dont know if you did the right thing though. I mean, you should only invest what you can afford to lose. However, since you have invested on a good coin, I believe that youll definitely earn something in the future.
Whether it's right or not but for sure selling that car for a lively investments is a wise choice. If I think of using that car for longer time, I guess that's a dead invesment when a car will become older in time. But for an ethereum, longer terms can be a good chance for us to gain more profit while buying it at very low price right now.