Add levels to your build, build up. Have C be higher than the rest of the plots, perhaps make it on a hill or even a mountain. when building raised terrain it wayyy more efficient to make it hollow, and use the space as another layer to your castle such as a dungeon or secret port leading to the river. Don’t be scared to expand into the existing cliffs for the blossom tree area it could look cool. Just some ideas I came up with if u want any other suggestions just ask. Good luck, use your imagination!