New construction is looking for a garden planner because we are not creative enough

placement is more important.

Look at how the sun moves, where and when you want to sit in the hot tub. The wind is also important: accordingly, wind can be well blocked with 2-3 bushes/grasses or 2-3 hedge plants.
There are non-fiction books that are specially tailored to "modern" or low-maintenance home gardens.
Mein-schöner-Garten also has many links to such topics...

Basically, it is always nice to "mark out" harmonious shapes in the soil. Angular shapes do not suit flora. A small maple is suitable as a solitary plant, smaller bushes are better grouped.
Very roughly:
Take a corner, plant a shrub there, a compact flowering bush to the front left, something evergreen to the front right.
Perennial or grass beds (also roses) are suitable closer to the terrace (fragrance, maintenance, grace).

Where do you want a hedge?

Do you have any requirements in the development plan regarding the planting?

Do you have water supply and drainage as well as electricity for the hot tub?

Water, wastewater and electricity are available in the garden. We could move anywhere. The B plan does not require anything. Fence max 1.8m high. The hedge would be on the right in the first and second picture. So towards the undeveloped field.

I would place the seating area with fire pit to the right of the house. Then you will also have a shaded spot in the summer.

The location of the hot tub depends on when you use it. Either to the left of the terrace at the house or also to the right of the house nicely far away from the neighbors.

By the terrace where the privacy screen is now I would create a planting bed. Either with roses, lavender, and early bloomers like tulips or grasses like Chinese silvergrass, switchgrass, plus candle larkspur, blazing star, coneflower, and tulips.

I would also give the hot tub a border with a low-maintenance flowering bed. It feels better that way.

For the hedge, I would choose a robust one like bird protection hedges. They don’t need trimming and once grown in don’t require watering.

We would still like a few flower beds, trees, a seating area, possibly space for a hot tub, fire bowl

There is a gardening show on ZDF. You can simply watch the results there.

There are often garden consultants in the alternative sector. I had someone for herb planting and an edible garden for 180 euros including a plant list, an on-site visit of 1.5 hours, and a hand-drawn plan. Such advice can certainly be found for you as well.

Otherwise, despite a preference for modern shapes and colors, plan "in layers." What comes to the foreground, what to the background?

The idea with the right side of the house is not so bad. However, that is the 3m area and the only access to the garden. Therefore, I have excluded it until now and simply considered it as a green meadow. But placing a whirlpool there would get tight. We know various garden documentaries. We find great ideas there, but we can't manage to put it down on paper as a complete concept. Hence the question here.