It's hard to know just how low the AUD can go at the moment as the Fed interest rate grows over the rest of this year. RBA forecast is no further rate hikes until late 2019, whereas Fed by that time will potentially have another 4. This turns the USD into a huge carry trade against the AUD. I am only new to fx trading but these kind of macro factors are unusual. USD is going to get much stronger. US economy has large problems (twin deficits, unfunded liabilities) but there will be a USD shortage in the 12-24 month period and this means USD bullish.