High curb and concrete, but which one is recommended?

*cry* Oh dear, where am I supposed to put all this soil, I don't need that much anymore

If there really are 10cm of soil everywhere, that's just under 5.5m³

Too bad, so still a lot of manual labor, or just rent an excavator.
I really thought that since there have already been dozens of excavators and the like over it, nothing would settle anymore.

So I made the splash guard with 5cm lawn edging and used mixed bagged material (25kg + 30kg). One bag yields only about 15 liters, which is really just the absolute minimum amount for 1m.

I wouldn't mix it myself again. Prepare everything well, lay out the stones, and then get ready-mixed concrete. That's how I did it now for the footings for the carport. The minimum order quantity at the concrete plant is 0.3m³, which by weight fits exactly on a hardware store trailer (675KG). With retardant from the plant, the damp (or slightly more) concrete is workable for a few hours. For 14 footings I needed 3 trailers. (1 trailer = 38EUR gross). Deep edging is coming again soon as well. I would never want to mix it myself again.

Hi, if I do the sidewalks from the house to the garage/parking space, does the soil underneath also need to be removed and filled with gravel, or is there hardly any load, just continue to level the existing soil with more soil, compact it, put grit on top, and then the paving?

The problem with soil is that it is usually frost-sensitive and the load-bearing capacity is simply not given in the long term. Sure, on footpaths it will have less impact than on areas with traffic. Nevertheless, sooner or later there will be irregularities. Also, everything naturally grows well in soil, which you don’t want either, and that will happen early enough anyway. Even though it’s a lot of work, better to do it right now than to be annoyed for years later. Maybe you should really borrow a mini excavator and shovel it away in one go. If you can’t spread the soil anymore, put it in the classifieds; someone will come and pick it up sooner or later.

If I read all this I would stay away from it....
At least one person has to know the subject, the rest just helpers and stone carriers. Otherwise you will have to redo the driveway after a few years because it has settled, slope to the house or something similar.