I really do encourage experimenting more with NixOS. It’s the strange combination of feeling safer (because of the rollbacks) and more powerful (because of all the modules and packages already setup by the community)

I also spent a while using Proxmox. Almost went with it over TrueNAS. It was a little bit of a tossup, one is a good VM manager with ZFS support and the other good ZFS manger with VM support. I ended up just liking the interface better for TrueNAS, but both are certainly capable