If one big wall won't do, several low walls with level terraces between may be the right solution. Consider paving a level to create a patio and a comfy seating area. An inviting midslope patio is a great place to sit and survey the rest of your garden.
Pretty herb garden with Lavandula stoechas 'Pedunculata' Allium giganteum. purple fennel angelica and many more plants.flowers at the back of the herb garden don't need to be touched but look pretty and tall.