If you want to do it again after closing your account, you can generally save money directly. If the trading software couldn't get in at that time, just call the futures company and say it, without going through other formalities.

The so-called account cancellation only means that investors have no objection to all transactions before fully withdrawing funds. Futures companies don't have to settle customers every day with zero funds, but customer information still exists. Normal trading status can be restored at any time.