Hmm, I would even consider to remove the other one that is competing with it, it seems good to have some layers.
You must be carefull with too many branches coming out on the same spot, it can lead you to reversed tapper.
And I'm not aware of what your goal is, you want to make it bigger or just keep it, because when a tree is on a Bonsai pot, there's no much changing on it's design, even because development is a lot slower then, what's why we move to Bonsai pot when it's close to finished.
But for now (if you want to just mantain it) I would just let it grow, clip it back, let it grow clip it back to get more ramifications.
I still find a bit difficult to decide what to keep and what not to when it comes to structure, sometimes takes me months to decide...