The best way to buy the bottom:

First, only copy BTC, wait for the historical high of 69,000, and then change to ETH/copycat. The reason is that BTC continued to be strong in the early stage, and after BTC broke new highs, the cottage really started a large-scale upward market.
2. Lay out all coins at one time, eliminating the step of changing positions. The disadvantage is that if BTC rises on the way back, the cottage will fall sharply, and the mentality is not good and it is easy to operate frequently. If you can take a long-term view and tolerate short-term declines, you can use this method.
Third, copy 50% PositionBTC, and the remaining 50% Position layout the cottage according to a certain proportion, and wait for the BTC to break the historical high of 69,000, and then replace the BTC with a cottage. Here's a compromise.