Here is a quick review of the Aussie dollar ETF (FXA) showing how the latest trend change was so easy to see, and that a sell off was always to be expected.
The Gann Angle 1x1 (45 degrees) can be used to check the health of the trend. With a bullish trend the upwards 1x1 Gann Angle should always win, and in a bearish trend a downwards 1x1 Gann Angle should always win. When there is a change in behavior then a trend change can be expected. This is exactly what happened recently to the FXA (ETF for AUDUSD forex pair).
Using Gann Angles with Hurst cycles always works well. See here: The Australian economy is in the long drop