$WLD |4-hour MACD|Death cross below the zero line
Before looking at position size, first understand MACD.
The length of the bars represents the gap between DIF and DEA. If the bars grow longer one after another, it means the current trend is gaining strength; if they get shorter, it means the trend is weakening.
A crossover is just a signal. Whether the price can break through the nearest support level and whether trading volume confirms the move are often used for further validation.
Indicators can fail, so don’t skip your stop-loss: deciding in advance what to do if your judgment is wrong is more important than predicting correctly.

Make your own decisions about buying and selling; don’t follow the crowd blindly.