Earn money outside of work?

Hello my frugal friends. Since I'm currently looking for a new car and I noticed that I definitely don't have enough money for the used car market these days, I thought about how I could increase my income. I work around 50 hours a week for €60,000 gross per year (38 hours a week and around 24 hours as a surgical nurse (of which only one hour is counted as working time and only on weekends, really crazy)). Do you have any ideas what else to do?