I hope this post is not too off topic. I thought that it would be nice to see the address of all the small self-hosted instances of Lemmy (1~5 users).
For container orchestration, which is mostly what k8s provides, then you could use docker swarm or nomad. You could use docker-compose with multiple replicas of the wanted container + a load balancer to divide the load.
In general I don’t think k8s/k3s is needed for hosting lemmy yet, but since I have a setup for k3s, it is easier for me to use it.