I've seen plants in containers fruiting at 6 feet. When they finally get started, they can fruit four or five times a year. Keep the tree mulched. It bears well in sun to partial shade. You might supplement this with a half strength liquid application of a bloom special to try initiating flowers and fruit.
Jaboticaba probably belongs in a class in with some other ornery blooming plants.
Wisteria vines in the north are famous for being erratic bloomers. My Tabebuia avellande is in the same class at the moment. It is growing madly, but puts out only a few blossoms. In Europe fruit growers sometimes partially girdle branches to stimulate fruiting, but I think this is a bit radical. A. Loquats are edible and considered quite good.