Although price is still bullish i would prepare for possible reversal. JPY historicly straightens from january to april 0.67% (fiscal year end jpn 0.21% ). You can also expect big institutional players to take profit which will create a demand for USD and JPY thus straighten them. Basically i expect risk off trading conditions for the next month or two.
If price breaks and close below channel we can look for retracement and then sell.