$BTC buys at the bottom when others are most fearful. To what extent can fear allow for buying? We have integrated the greed index with colors into the candlestick chart. It can be seen that in the last 2 years, when it drops to blue, it indicates a great buying opportunity. It is clear that the greed index is still at a high level now, so it is only suitable to play with small positions. Large positions can lead to being trapped, which severely affects one's mindset and may result in being forced to exit early.