disk disk default 32 gb, discard on

cpu enable numa for dual+ socket systems choose skylake-client type, or other option depending on your architecture name

mem balooning on

net bridging with firewall on if migrating, reuse the mac addr of the existing machine. Note that mac's must be distinct on a lan, so you won't be able to have both running at once if you do this.

copy /var/lib/libvirt/image/ qcow2 file to proxmox host (check the timestamp or config to make sure you get the active disk for the vm you are migrating)

to import the disk run: qm importdisk <VMID> <disk>.qcow2 <proxmox storage pool name>