Hi Jamie,
I forgot to ask, but I am assuming this is a Port Jackson Fig?
If it were mine and if I have not cut off any roots yet, then I
would just leave it till next year. Down here, we get about another
5 months of growth, slow down markedly in April though.
And after you get some shoots, start to feed it as much as it can
take.
Next summer, I would put onto a larger shallower pot, of the big
roots, I will spread them out as flat as possible, possibly cut off
some, to the length you want, at the time of transplanting.
And then when it regains strength, and the cut ones have sent off new
roots, I will cut off the others -- progressively.
I have a very healthly (PJF) one, which I have repotted in around late
October, I cut off some big roots, cover it with soil, lay some pieces
of old flat timbers on top, it sends out roots like crazy under the
timers.
Have fun -- I have marked this one. I would like to see it pays off for
you
Cheers.