Based on Elliot Wave Theory, price has finished wave 3 and met minor support. Price needs to pull back about 100 pips in order to drop further. In addition, H1 MACD and RSI have formed bullish divergence that support this assumption.
Wait until the pull-back is finished to enter short position is safest, or enter short when D1 support 1.67130 is confirmed breached. TP 1.66500
Risk takes might take long position to trade the pull-back, however downside risk is far greater so proceed with caution.