As you can see there is also bearish cypher pattern in play which could fuel further downside on this pair.
I think the target will be at 149.50 in order to price make another pattern for retracement.
For now we will just focus on the downside because we don't know where price will stop the drop in the future.
Sell GBPJPY 151.70
Stop loss 152.30
Take profit 149.50 (3.6R)
Use only 1-2% risk
Good luck