I pruned my Acubas on Long Island anytime. Why? Because they respond very well to pruning.
You can take off large branches, smaller pieces, whatever. You can kind of shape it as you go. My best advice is to take off those big branches on the left all the way back. Then work on shaping.
It is a little hard to explain but with mine, when I reached in to what I considered an 'offending branch, I cut it back to a juncture or a joint. And if there were one or two other possible branches at the same joint or juncture, I pruned them too. Since they branch in clusters, I would leave the two or three smaller branches in place to fill out the shape.
Keep stepping back and check your work as you go. But they respond so well to pruning, you'll be doing it almost yearly. You really can't make a mistake. It seemed to me that after 2 months, all evidence of your shaping have disappeared in a wave of new growth.