ᐅ Floor plan design for a hillside house with 5 children's bedrooms

Dear fellow contributors,
I’m sharing our first attempt at the floor plan. Unfortunately, I can’t fill out the list because copying it over on my phone doesn’t work properly, sorry.

Key data:
5 children between 0 and 11 years old
2 adults in their mid-thirties
Plot of about 900 sqm (9700 sq ft), facing north
Building window edge on the street side: 17.35 m (57 ft)
Sloped site; within the building window, the ground rises about 2 m (7 ft) over 10 m (33 ft) from front to back

We want 5 small children’s bedrooms, a slightly larger office for working from home, a master bedroom, three showers, three toilets, a bathtub, and access to the garden through the living room on the upper floor. One wall in the children’s rooms should be removable later.
The attic is walkable.

We are allowed to build 2 full stories, with a ridge height of about 12 m (39 ft) and an eave height of 11.6 m (38 ft).
We would prefer a hip roof.
The current drawing is 9.5 by 11 m (31 by 36 ft), but we would like to have around 195 to 205 sqm (2100 to 2200 sq ft) of living space later; garage or storage will be added.
The back wall of the house is embedded up to about 2 m (7 ft) into the slope.

I will try to attach a rough overview of the plot.