OK, you have the citizenship which at least overcomes one obstacle.
But the hard facts are approaching age 40 is leaving it late in today’s situation to be starting on a flying career. In more prosperous times a new CPL at that age would have had a chance in GA - maybe doing tourist scenic flights, where some operators liked the more ‘mature’ look, building time, moving to charter and for the lucky few, eventually to corporate.
But if you have been following other threads you would know that GA was all but finished in this country before the virus struck. Now most of it is finished.
Well funded or airline backed flight training organisations may survive (though the general downturn in demand for new pilots must be a worry) and specialist work like the RFDS and survey, mustering operations etc will continue, but these are not entry level jobs.
Also, as mentioned above, ag flying is a full-on profession in its own right, so strike that one off your list - particularly if you stay in the Sydney area.
It really does seem that to fly, you will forever have to pay as you go.