The Aussie dollar is very dependent on the price of gold, as Australia is the 2nd largest gold producer in the world. If gold prices fall, this means Australia is getting less money for that gold, and generally the Aussie dollar will weaken in these circumstances. If gold prices rise this is great for Australia and their dollar will normally strengthen with the rise in the price of gold.
The problem is that this is where traders are most likely to succumb to overconfidence bias. It's not uncommon for traders to complete a winning streak and then believe that they can't get anything wrong in the future. To believe this is of course unwise, and is only going to end in failure. Make sure you always analyse your trading sessions and look at your wins and losses in detail.