Car insurance without parent car ??

Hello, I have one question: I finally have my driver’s license in the next few weeks (with 22 , but that’s a different story), and of course I want to register my car too. My problem is that my parents don’t have a car or a driver’s license, so I can’t register my car as a second car. Are there any other ways to reduce the insurance costs? Unfortunately, my parents are also both single children and therefore fall t also uncle or aunt away I have already done the HUK24 with the online computer and must say that it is extremely expensive without the second car regulation! Thanks already for your help