Financing cars without permanent employment contract

Hello, I am currently in a temporary job as JobCoach – training counseling in an educational center. The term of time is linked to the duration of the project I have supervised. Due to my temporary employment contract, I can unfortunately not finance a car, I am a single mother and do not have large reference persons who support me financially. I would like to finance a car. I would be grateful for a positive feedback. Greetings