I also thought of something curvy to start. With my vision issues and scrappy style, I find it really hard to mark a quilt so I can see it, if I can get away with a grid it helps a lot. There are things I can (and do) freehand, but I don't think I would like what I could do with that top. Sadly, I am quilting challenged in thinking of how some people can elevate a simple quilt by their exquisite design choice... I can make them stick together in the washing machine.
I am another big fan of Serpentine stitch if you have it for a domestic machine. Your workmanship is exquisite! I think "waver" of the serpentine stitch will help with all the many intersections you have and still give easy visual motion.