Be fearful when others are greedy, and be greedy when others are fearful. In the cryptocurrency world, you should be greedy when others are fearful to the extreme, and be fearful when others are greedy to the extreme. In the cryptocurrency world, there are no fixed indicators like price-to-earnings ratios. This peak is hard to grasp; usually, when it rises, it seems endless, and when it falls, it feels like a bottomless pit.