You touched on a good subject. Because bitcoiners are not only those who have large funds in btc and are rich. The bitcoiner is the one who believes in the bitcoin project and everything that revolves around it, decentralisation, privacy, financial freedom, etc. And in the meantime that he accumulates satoshi, he tries to survive by choosing alternative paths to the ones that society has always laid out for us. Car sharing could be useful, there are many apps in various cities, it reduces costs and environmental impact. Or get together with neighbours or colleagues or other parents and take turns sharing cars, if you can match schedules. Those who don't have a car can offer another favour in return, such as mowing the lawn or similar.