To build architectural home walls is usually the cheapest. Wood or other plywood and to a large extent contain cores that are not subjected to pressure treatment by making wood construction. They will most likely rot and fail quickly within a few years.
Building a retaining wall for wood is hard work. So use wood that can withstand it in “architect bærum at https://www.wood.no/prosjekter/pabygg-baerum” (which is also known as "arkitekt brum kl https://www.wood.no/prosjekter/pabygg-baerum” in the Norwegian language).
You can even use wood with a vinyl or polymer finish. Homeowners hire a leading company that supplies quality wood nationwide and offers a wide variety of vinyl finishes that will keep wood last almost forever.
One aspect of my retaining wall design that differs slightly from the others is that to incorporate the entire wooden support structure with the reinforcement being pushed vertically through all the pieces of wood and into the ground with an opening that, if fully adjusted, passes through all of them.
Drilled wooden elements of the retaining wall. The fittings must fit snugly in the borehole. This move may be too big, but strong things that take a long time.
An alternative, but similar, a method is to push the ribs through the bottom two or three layers when the wall is about halfway and then join the lower strips of wood to the top layer after the top layer has been added.