Parking spot in Berlin

Hello
I live in a bus in Berlin with my 10 year old daughter. Does anybody have any ideas on a place we can install ourselves? We have tried all of the local Wagendorfs, Karow, Lohemulle, Wuhlheide but they are all full. Looking for any leads you might have to other locations or websites where people talk about this stuff. We need a new situation by May 1, 2023.