EventBridge Lambda concurrency limit for WFM events

Trying to process high-volume interaction events from EventBridge for WFM adherence tracking. Lambda hits the concurrency limit and drops messages. Using Node.js 18 runtime. Getting ThrottlingException errors in CloudWatch.

{ "error": "ThrottlingException", "message": "Rate exceeded" }

Any idea how to handle the backpressure without increasing the concurrency limit manually?