Bitcoin may drop to $73K by April 1 before turning bullish again, with key support at the blue channel and $80.5K.A bearish engulfing candle on the three-day chart signals potential retracement to $73K, with $80.5K as the first support level.Bitcoin's test of the 200-day moving average is crucial for maintaining bullish momentum, with a failure to hold it risking further downside.Bitcoin has been ranging and could fall to $73,000 level by April 1 before turning bullish again.