Repotting my first bonsai to a smaller pot, maybe it’s last

I started this bonsai from a seedling, about 6 years ago, it's an orange or a clementine – I forgot 🙂 -. The trunk isn't thick as I wanted cause I couldn't let on the ground long enough.

So its don't have much taper.

Still creating ramifications at the branches, especially at the apex, that I'm finding a challenge. And the apex isn't quite appealing to me.

It have been my "to learn tree", any tips to enhance the styling?