River's Edge
Masterpiece
If the Tree were mine I would air layer the base and create nebari below the flare for the main portion. I would not keep the existing nabari. The other suggestions would create another nice starter project on the left portion. I would then work on branch structure. They thread graft easily and creating nice compact trees with small foliage is easy. Amazing fall colours. Two pictures attached. One with a small addition for extra air layer. One showing fall color and thread grafting on two shishigara I developed quite a few years ago.