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Nguyen Hang Hai Ha  
Martingale is a risky trading strategy that can cause your account to collapse in a long losing streak. However, you can reduce the risk by doing the following:
If you have 1000 USD, you can divide it into 2 accounts:
+ Account 1: balance 500 USD, trading 0.01 lot, setting Only Buy (Only Long).
+ Account 2: balance 500 USD, trading 0.01 lot, setting Only Sell (Only Short). Set this feature in the Common tab of Setting.
If it reaches a high-risk stage and 1 account evaporates, the remaining account will continue to be divided into 2 accounts and start over.
If the balance is larger, you need a plan to withdraw profits regularly.