I'll set up a new Proxmox VE server for you, or fix the one you've got. That covers ZFS pools, networking and VLANs, VM and LXC templates with cloud-init, GPU passthrough, and backups that actually restore.

The cover is my own node. I run five VMs on it around the clock, with a ZFS pool for media and a separate disk for backups, so I've hit most of the usual problems myself (storage filling up, RAM overcommit, passthrough that won't stick).

It can be a single annoying problem, a full setup from a fresh install, or a cleanup of a server that grew a bit wild over the years. Access is over SSH or a remote session, whichever you're comfortable with. Let me know your hardware and what you want it to run.