**Cryptocurrency A Trading Strategy**

1. **Trend Following**: Use EMA(7) and EMA(30) golden cross and death cross to determine bullish or bearish direction. Go long when EMA(7) crosses above, and go short when it crosses below.

2. **Key Levels**: Enter the market when breaking through previous highs/lows; set stop loss outside recent support/resistance and take profit at 1.5 times the stop loss.

3. **Volume and Price Coordination**: Add positions on breakout with increased volume; add positions on retracement to the trendline or near EMA(7) with decreased volume.

4. **Risk Control**: Single position size ≤5%, total risk exposure <20%.

5. **Exit**: Exit when EMA(7) crosses in the opposite direction or falls below the 3-day low (bullish) / breaks above the 3-day high (bearish).

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