Here in Munich, the stepped top floor is quite common because the plots are usually rather small. When you stand directly in front of such a house and look upwards, it looks much less bulky than in the drawings because the perspective is different. However, this is only the case if the stepped top floor is recessed on all sides. I would have definitely advised you to do that (but you have already noticed that yourself). And to push back the garage (as also suggested by 11ant).
Here is an example image where you can quite clearly see what I mean. The building structure of the ground floor and first floor comes to the foreground, and the stepped top floor and the garage recede into the background. If you highlight it with color, the effect is even stronger.
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Otherwise, I would make the utility room smaller and add the space to the living room, and rather have another storage room upstairs. For that, the office should be somewhat smaller. 12 instead of 11 meters in length would relieve the living-dining-cooking area even more. The kitchen is currently too small (distance between countertop and island as well as the depth of the island). If you add one meter to the width of your house, you will need a different layout towards an L-shape. Otherwise, in my opinion, it won’t be very effective.
In the stepped top floor, there is not enough space for the wardrobe and the sauna is far too small. But that has to be new anyway, because it is recessed everywhere. This necessarily results in a new position for the staircase. You have to think through how that works best. I could also imagine an open staircase across the width that separates cooking-eating and the living room. Obviously, it doesn’t bother you that the staircase is open and not enclosed in a hallway?