If you followed EngineeringRobo's BUY signals such as BUY 2, MOON & GREEN CLOUD, do not hurry to sell it. Wait for candles to reach at resistance level or EngineeringRobo's sell signals.
If you haven't bought it yet, no need to hurry to buy. You can wait to buy until the resistance level ($21) turns into support level. After that you can buy it with the target of next resistance level ($31).