I can see people are talking about language fluency now... but... hopping back to what OP was saying earlier ...
OP thank you for suggesting -
"Understanding the Swiss", by Margaret Örtig-Davidson book. Sounds like it'll be a great book to read for interest.
What else do you find unusual in where you are, about life in Germany, compared to what you are used to in England or Switzerland ? (Will take it in context of what you've noticed where you are currently living, rather than being generalisations)
I did a pen pal exchange through school with a lovely teenage German friend where we spent two weeks living with each other's families (together) practising our languages for O Levels as a young teen (about 14)
I remember how much more freedom her friends and she had to go out later than we'd be allowed, that she called her parents by their names(!!!), how much more confident her classmates/ friends all were, and so open and friendly.
She said it was more usual in Germany to rent than buy, these large flats, & to move around, she found our little houses and "sweet tiny gardens" rather quaint and eccentric.
She introduced me to mayonnaise on chips (30+ years ago) which was a revelation (at the time) and didn't like salt and vinegar we put on ours when here. And she found our breakfasts ( back then was Rice Krispies cereal or jam on toast) far too sweet and I was delighted to have spicy German sausage slices with sour savoury vegetable type mix & croissants for breakfast.
(Of course now we have a more mixed influence on what we eat but it was so different as a young teen used to rather more bland English food - at least for breakfast!)
And her city's roads & sidewalks were so spacious, straight and well designed, but she had to drum into me you mustn't ever cross except for on a crossing, waiting for cross signal, as was an offence or socially frowned upon, to cross elsewhere without a signal. It would teach young children bad habits..
AND their schools didn't have school uniform, they could wear what they wanted, not just for the occasional dress down day! Everything was bigger and better organised and most of her classmates were generally tall giants compared to me and my classmates who went over. I thought i was tall...
When I was asked questions all her classmates were very confidently direct. They thought me sweet, shy, my classmates similar (of course we weren't shy but perhaps less directly spoken at the time!) .
It may just have been her school and specific city & where they took me to visit for days out, but it was bigger, more sporty outdoorsy and more logically designed than the higgledypiggledyness of the part of England I grew up in (which wasn't exactly too far from London and definitely not rural and fairly typical of English towns)
I loved seeing how quaint and cute (ie smaller scale) she found England and how overly polite she found our conversation unless we knew someone really well. It may be that was a different era, but super interesting to be same age but such different lifestyles.