Reconnection of lost master nodes to the cluster

Hi,
We have a kubernetes cluster managed by microk8s using Portainer. Earlier It has 1 master node and 2 worker nodes and 100s of Deployments, PVC in the cluster.
We added one more master node for high availibility, but on that configuration we disabled and enabled ha-cluster in main master node, from then the master node is not showing any worker node on performing microk8s kubectl get nodes. And Portainer was based on the main master node so its console is not fetching any details.
Second master node is not running microk8s due to any error while doing join node to the main cluster.
Its been couple days the cluster is down.
Could you please help how we can rejoin any master node to the cluster so we keep using our application.
Thanks.