The dead months can be an opportunity for short-term investors, for example, BTC can rise by 10% and fall by 10% in the same month, for a long-term investor this was a garbage month, as the price didn't go anywhere, for a short-term investor, they could take advantage of both trends, it also works for algorithmic investors, although depending on the timeframe, this could also turn into a hell of false signals, something that wouldn't affect a long-term investor, you need to know how to operate and be aware of the pros and cons of the different ways to invest.