Challenges in Migrating to Rancher

Hi everyone, I’m curious about the experiences of those who have migrated their infrastructure to Rancher. What challenges did you face during the migration process, and how did you overcome them?

I also check this : https://forums.rancher.com/t/how-to-migrate-from-non-rancher-launched-k8s-cluster-to-a-rancher-launcheqlik-sense But I have not found any solution.