I got error "nsufficient permissions to list objects
After you or your AWS administrator have updated your permissions to allow the s3:ListBucket action, refresh the page. Learn more about" after setting deny policy to the bucket and I’m not able to remove bucket
I would check out : https://docs.aws.amazon.com/AmazonS3/latest/API/API_DeleteBucketPolicy.html regarding DeleteBucketPolicy
The IAM policy simulator can also help in troubleshooting IAM issues.