With the current momentum, it is suitable to backtest building long positions, rather than opening short at a high.

Friends who want to short can start building positions in advance, with a total position of 10,000 USD. For example, if the price is around 118,000, you can enter with a 20% position, using 3x leverage. Invest the 10,000 USD in five tranches, shorting Bitcoin with 3x leverage. Every time it rises by 2,000 USD, enter with another tranche, systematically shorting Bitcoin. Once Bitcoin hits 128,000, you can use up your bullets and make a profit.