Fixed investment is more suitable for ordinary investors, because the risk coefficient is relatively low. Every plunge is basically a good opportunity to build a position. Of course, specific issues must be analyzed in detail. 2. No one can predict that Bitcoin will fall sharply in a few months. What if it rises? Therefore, the fixed investment is relatively low risk. 3. For careful consideration, each fixed investment amount should not exceed 20% of income. 4. The time does not have to be fixed on a certain day. Every time you encounter a sharp drop, you can make a fixed investment, so that the cost of opening a position is lower.