How to find Qantas award seats from Singapore to Brisbane January 2019?

Have enough QFF for 3 business class award seats from Singapore to Brisbane Jan 19 (4-8) but there are none and have been none available for a few months now. There are not even any economy seats available. Is it likely more seats will be released? How long should I wait before I give up and just buy economy seats home to Brisbane

I would give up. That’s a really busy time of year. All I can see is 3 x economy via Perth on that date.

If you do buy tickets, see if you can cancel them without too much penalty. If you can, keep your eyes on award availability as you might get lucky.

Thanks.  Yes I’ve decided to come back via Perth, have a couple of days visit and then on to Brisbane.  Was able to use points for both legs and cost $480 for taxes etc.  So for 3 people thats way better than $2k buying flights