My eyes were drawn back to the houses in the small village where I live when I saw your wooden retaining wall. Nearly all of them have a history of at least 80 years. Which means, in your case, that you can look to the future with a great deal of hope. There is one small detail, however, that I would like to point out. All of these houses were built without having to nail one single one down. That's why you can easily move them to a new base. How does it work? Have a close look at the dovetail joints.
That is some good engineering, hopefully mine will last decades. Though we did not do dove tail joints, maybe it would have been smart to do that.
The ‘ancients’ knew very well how to handle wood! 😉
We should be copying them much more often.