(Fellow country man here!) That still sounds like a lot to be honest. According to the yearly stats we receive from our trash collector: in 2021 our family of 4 produced 27,50kg of non-recyclables. That's not per month or per person but for all of us for the whole year. Granted, no diapers anymore here; that takes quite some space (and weight, which is more important since we pay per kg).

We saw a significant drop after they started collecting plastics separately. We have a 120 litre bin that we put to the curb every two months or so. I don't quite understand what people are throwing out all the time that you can fill a large bin every week...