There is a very useful 'Panic Thermometer' in the US stock market called the VIX Index, which we have discussed many times before. In simple terms:

Combining data from the three economic recessions after 2000, here is a summary of personal bottom-fishing ideas (for reference only, no guarantee of correctness):

Taking the S&P 500 index in the United States as an example, it has dropped every time the economy worsened, and it is quite valuable for reference:
1. In 2001, the tech bubble burst, and the S&P 500 fell a maximum of 49%, with an average drop of 22%;

2. In the 2008 financial crisis, the S&P 500 fell a maximum of 57%, with an average drop of 38%;

3. In the 2020 COVID-19 pandemic, the S&P 500 fell a maximum of 34%, with an average drop of 28%.

Looking at it this way, the S&P 500 averages a drop of 20% - 30% during each recession.

So my strategy is:
Wait for the S&P 500 to drop about 20% from its current level, which means dropping below 4000 points (or around 4400 points, depending on the specific price at that time), and then start buying Bitcoin in batches.

In simple terms, it is based on the historical patterns of significant stock market declines, not expecting to buy at the lowest point, but waiting for the market to drop a certain amount before gradually entering and diversifying risks.