Make a form, pay attention to your credit card status frequently, and remember the billing date and repayment date of each card.

On the billing date, fill in the bill amount in the form immediately after the credit card is billed. You can also estimate the bill amount for the next month.

I have several credit cards, as well as mortgages, online loans, etc. I make a form myself to plan my monthly salary. I have been doing this method for several years and have never forgotten it.

The above is personal experience for reference