How can i change the default routing policy

I have created 2 contact points in grafana test alert is working but the alerts which are specific to contact points are not triggering

Hey, you can go to the Groups tab (/alerting/groups) of Alerting to take a look at which alert instances are sent to what contact points (you can expand each alert instance to see the Receiver (contact point) it was sent to
Maybe this could help you debug your configuration