Floor plan planning single-family house approx. 230 sqm with L-shape

I looked at the elevations again: those are definitely venetian blinds indicated on floor-to-ceiling windows there: THERE IS DEFINITELY way too much window area for a bedroom. Brightness is nice, but the heat from the sun stays in the room. You can't get it out. You would have to use technology for that again. And as already said: you don't relax in the bedroom to enjoy beautiful views. Give the kids that, and that’s fine.
The room itself, and considering that the facade can always handle a solid wall here and there, I would give the bedroom, if it is to stay upstairs, an east window. A balcony door, for sauna purposes, should probably stay. Forego the south side, because: a normal bed would have trouble with the width in that position... it is also always nicer to look onto the bed when entering.

- I find the main outdoor seating area by the kitchen of 10sqm too small again. We have 30... and it could still take another meter. Or did I miss something there?

Or is there another solution?

Yes, of course, with 5 there is quite a lot that adds up, which already speaks in favor of a basement.
The resale value also depends on a more appealing facade.

You invest 1.2 million + x and build a visual compromise. Is that the right adjustment?