There's an old saying "Buy when the market is green and sell when the market is red".
It's arguably one of the better strategy as your money won't remain stale. When you see a bullish trend, you  buy the first moment you can and when you thin it's turning into a bear, you sell. Short term investors earned a good profit in last 1 month as compared to holders that are holding for last 2 years. Different people have different strategy when it comes into trading but the essence is to increase your profit while limiting your loss.