High Frequency of AWS CloudWatch alarm for invoking Lambda Functions

Hi AWS, we are getting the high frequency for cloudwatch core service alarm while triggering lambda functions. The alarm detects a high number of throttled invocation requests (crossed the threshold of 1500.0). We need to investigate the cause and either adjust the threshold of the alarm if it is acceptable or propose a solution to avoid the threshold from being reached.

The method we are using using the lambda function is to copy the files from first S3 bucket to another S3 bucket. It works well with files that are sent with the low frequency but files arriving with high frequency are causing the problem described above.

Can you help me on how to lower down the throttling number for the lambda invocations made?

Please guide.