Your next task would be to focus on compacting that foliage. Your branches are long ans only have leaves on the tips. Two possible ways to go about it: bend those branches like crazy, so the foliage is closer to the trunk. You can do this now. In fact, ficus are so flexible, that if you dont really bend those branches, they will be back to their original position a couple weeks after you take the wire out. So over wire.
The second option is to wait and see. It is common for benjamina to sprout a second bud at the base of an existing branch. That will give you the oportunity to get rid of those long, leggy branches and grow a new one from the same position and work on ramification from the beginning, thus having a more compact tree.
Good beginning! Keep us posted as to how it develops