Use L-stones for slope stabilization.

Instead of a 2 m high L-block wall, we had a gabion wall of twice 1 m built. It was somewhat more expensive in terms of price because all the facing stones were placed by hand and the finishing curve was constructed as a dry stone wall, but the slightly higher price was worth it.

Gabions can also be filled by yourself, which makes the matter significantly cheaper. Setting L-blocks of that size... without an excavator?
The neighbor had L-blocks set at different heights. The smallest is 40 cm high, the largest 2 m. Without an excavator and wheel loader, this would not have been feasible. Machine hours also cost money! The craftsman has to earn as well.
I find the initially mentioned price of 200€/sqm for a 2 m L-block including substructure and installation realistic.

2m height would be fine - but the 200€ only referred to half the height = 1m!

Oh God no, of course we also had an excavator. But for the two days it didn't cost nearly as much.
And we also set gabions on one side and also in EL. According to the landscape gardener, it should have cost around 2.5T, we bought four of them used and bought two more and including filling material a total of just under 500 euros. Here is a picture, but on the side that would be too expensive because those are higher up and you wouldn’t even see the wall...

I would be interested in your wall. Is there a photo of it somewhere? (We also have gabions and want to beautify them further with natural stone walls)

I will upload pictures tomorrow.

Here are the data already:
Length: 13.5 m
Height: total 2 m, each Gabione is 1m x 1m

How much lava is underneath I can also gladly share. Excavation was done up to a depth of 70 cm due to soil conditions.

Have to postpone until tomorrow. Not at home at the computer.