Hi Greenhorn,
What I'm about to suggest will be influenced by the time you are prepared to create a bonsai. If you look at top looking Trident bonsai they usually have a very distinct taper. The only way to do this is to be willing to make the "big cut". You may have to do this several times to achieve the tapper you desire. After making a cut there will be a number of new shoots appear and you need to choose one that is at the front of the tree. Wire or tape it into a vertical direction and let it take off. Once the new leader has developed sufficient girth, repeat the process. I'm in Sydney so I'm not sure when it would be the best time for you to make such a cut.
I have included a photo that could be something to start to do at this stage of development.
Have a look at the root system a little deeper down and you will most probably find a better root distribution. The root showing above the soil may be to high and need to be removed. Also, you may choose to remove the first branch if you don't want it as a first branch.
These are just a few ideas.

Look forward to seeing the development.
IMG_1303-2.JPG
Regards Ray
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