Changing to port to 4000 can be done by changing the value of the `port` field in the Service YAML file. For example, to change the port to 4000, you would update the YAML file to the following:

```yaml
apiVersion: v1
kind: Service
metadata:
  name: my-service
spec:
  selector:
    app: my-app
  ports:
  - name: http
    port: 4000
    targetPort: 8080
  type: ClusterIP```

You can also update the `targetPort` to match the `port` value, but this isn't required.
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