If this was my tree I would prune away the whole top, right down to the first side branch, but I would do this pruning next spring, right before bud break....just as the buds start greening up and swelling. After pruning and staking, the lower side branch will then become the new main-stem and will grow twice as fast because it will now be supported by an already established, root system. Overwinter this tree in a cool shed or garage, and keep the root-ball well hydrated. Try to prevent this tree from freezing temperatures. Fertilize and pinch the hell out of this tree next season. Grow it for structure, and branching. The fig production will come later once the basic framework of the tree has been established.
Don't know what your climate zone is but when a fig tree is grounded, just one bad winter can/will negate all your hard work. Then you could start over with a new tree...just like most of us who are growing fig trees "untropically". Seriously, growing in ground fig trees- in any climate that gets temps. lower than 40F - is taking a gamble. Fig trees are semi-succulents, and when frozen the greenish, newer wood is usually severely damaged. Freezing temps can kill off even older, established, trees. If you are lucky, the roots will survive and send up new shoots, but then, you're back to square one.
Hope this helps, and good luck.
Frank