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I would look into setting up a proxmox cluster ~~with high availability~~ on them and from there you can look into fun projects that you can run as proxmox vms or lxcs.
https://www.xda-developers.com/proxmox-cluster-guide/
https://pve.proxmox.com/wiki/High_Availability
edit: HA seems to require a shared disk, such as a SAN or NAS.
You should be able to do HA with ceph, I think. You can do almost-HA with zfs mirrors, where instead of instant failover you only lose data up to the last mirror sync (a few minutes max).
Ceph is great, we run critical infra at work on proxmox with ceph. Very reliable in my experience. It was definitely helpful for me to have ceph experience from my home cluster when starting there.