Out of all plotting diagrams the one that's like a dip makes the most sense to me. You live your life, you get knocked down, you try to climb out of the dip, you fail, you persevere, you get out to the new ground, you continue living but changed. You're learned something.
This little gif of Seth Godin's THE DIP illustrates precisely that.
Later I'll post my entire plotting process. For your eyes to feast.