Instance creation failed

I hope you are using the free-tier account, may be the 1 year of free tier has been ended or else you may not paid the bills after using aws cloud.

How long have you been on AWS? The following are reasons for not being able to create EC2-Instances:

1. You do not have the correct permissions to create EC2-Instances via policies.
2. Trust and Safety isolated your account for abusive behavior.
3. You have past due bills/invalid credit card and are in suspended state.

Start by following the steps here: https://repost.aws/knowledge-center/reactivate-suspended-account If nothing helps, open a case with AWS support. They will be able to tell you the exact reasons of suspension and also the next steps.