I'm still new to bonsai stuff - I've had my little port Jackson fig for just over a year, and it was apparently 2y/o when I got it last Christmas. It was going so well for so long. I had new leaves and everything. Then I left it in NSW with my parents for 3 months while I moved to QLD. I just got it back and it's a bare stick! It's still alive (the stick is bendy and feels green) but it has lost all of its leaves and I don't know how to bring it back to good health

any ideas? It's living on a windowsill with about an hour of morning sun atm. Was living on a verandah with 4ish hours of afternoon sun at parents' place.
Will post photo if that will help a diagnosis and treatment plan.
Cheers