i can't add new payment method

It sounds like you're experiencing an issue with adding a new payment method to your AWS account. This error message typically appears when there have been multiple unsuccessful attempts to add a payment method within a short period. Here are some steps you can take to address this issue:

1. Wait for some time: AWS implements this limit as a security measure. The error message suggests trying again later, so you may need to wait 24-48 hours before attempting to add the payment method again.

2. Verify your card details: Double-check that all the information you're entering for your debit card is correct, including the card number, expiration date, and CVV code. Even small typos can lead to failed attempts.

3. Ensure your card is supported: Make sure your debit card is from a major provider that AWS accepts, such as Visa, MasterCard, or American Express.

4. Check for bank restrictions: Some banks may have restrictions on international transactions or online payments. Contact your bank to ensure there are no issues on their end preventing the card from being added.

5. Clear browser cache and cookies: Sometimes, browser-related issues can interfere with the process. Try clearing your browser's cache and cookies, or use a different browser altogether.

6. Verify account access: Ensure you're logged in as the root user or an IAM user with the necessary permissions to modify billing information.

If you've waited the suggested time and are still encountering issues, it's advisable to contact AWS Support directly. They can provide more specific assistance based on your account details and may be able to reset the limit or help troubleshoot any underlying issues preventing you from adding a new payment method.
Sources
Cant change Payment method | AWS re:Post
Cannot make a payment with a new Card | AWS re:Post
why cant i signup for AWS free tier account | AWS re:Post