EventBridge to Lambda concurrency limits on CXone interaction events

We’re seeing 504 Gateway Timeout errors when processing high-volume interaction events from CXone via EventBridge. The Lambda function times out before it can finish writing to DynamoDB.

{
 "source": "aws.events",
 "detail-type": "Interaction Created"
}

Current concurrency is capped at 1000. Is there a way to batch these events or adjust the EventBridge rule to throttle the throughput? We’ve tried increasing timeout but it’s not enough.