That is not a jacaranda in the picture. When you google jacaranda bonsai most of the pictures that come up are wisteria, I'm fairly certain that is a picture of a bougainvillea, whatever it is, it is not jacaranda.
Here is a thread of mine. I have some videos in there. If you pinch the top growth it will produce two new shoots. If you wait and chop it you will get lots of new shoots. I do most of my chopping in January when the days start to get a little longer and the old foliage looks ratty. But again this is in Florida your care will be different.