What to do with the single limit of a U.S. credit card is as follows:

1. Cancellation at a bank outlet: You can bring your credit card to the counter of a bank outlet to go through the procedures for lifting the single limit.

2. Telephone cancellation: Call the bank’s credit card customer service hotline and apply to the bank’s customer service to adjust the credit card’s single transaction limit.

3. Online cancellation: You can directly cancel the credit card's single limit through mobile banking. You need to adjust the credit card limit through the credit card section.