Level the basement or the plot?

Depends, father-in-law still has a house there, it's about 1.5m down directly from the sidewalk, which is unusual. From time to time you can see that some have 2 or 3 steps in the front yard. The further away from the street, the less noticeable it is, especially when it is eventually overgrown. Here the question also is how much it really is with the floor slab and substructure.

Exactly, you understood that correctly. The rest would be filled with excavation from other construction sites.

Hello Mudo1991, in which direction did your decision go? We have roughly the same slopes on the property and are facing a similar "problem".