So, I have now taken some photos and tried to paint them understandably
I hope you can get an idea of how it currently is.
I have labeled the pictures accordingly
As mentioned, all the trees are to be removed.
With the option of the smaller wall and the steepest possible slope, the idea would be to cover the slope with fast-growing privacy screening, like laurel shrubs or something similar, with just enough space behind them for me to access for trimming and so that the roots don't possibly damage the wall.
However, I haven't made any concrete decisions about the type of privacy planting yet, so please don't criticize immediately if laurel is a bad choice because the root system might possibly damage walls
