I recently switched from Proxmox to ESXI for my primary Hypervisor due to better support for automation tools like Ansible and Terraform plus better integrations with Red Hat Satellite. I didn't fancy rebuilding some of my VMs and instead wanted to find out how to migrate them instead.
If you were using qcow2 images for your KVM VMs this will also work from any KVM based system, not just Proxmox.
First step is to convert your qcow2 image to a vmdk file that VMWare uses. I ran these steps on my