We cannot convert between different trading accounts for you. If you already have a trading account and need to open other types of trading accounts at the same time, you can directly apply for an "add USD account". Click here to see how to open a trading account.
But you need to pay attention to that, each user can only hold 3 trading accounts for USD Landing account at the same time, and only 1 for BTC trading account. Whether you can successfully open additional trading accounts, you need to go through the Compliance Department Review.
If the account opening is successful, you will receive an email notification of successful account opening; if the account opening fails, you can view the rejection record on the homepage of Trader Office.