Invest in your car to increase your customer satisfaction rate.
Customers do not want to ride in an old beaten-up car, with stains on the seats, and are less likely to give a ride like that, a high satisfaction rating. So invest in ensuring your car is in great condition, is clean, and has little extras that make a trip more enjoyable like vomit bags or mints. You can mention some of the extras you have in the tools section.