If you want simpler than Proxmox but still flexible, check out Start9 (StartOS) or Umbrel. Both have an app-store UI for selfhosting — click to install Nextcloud, Gitea, Vaultwarden, etc. Start9 has...
As a bit of an update, I ended up sticking with Proxmox. I went back through my notes I recorded when I first set it up, did some updates, and got familiar with the UI again. I've been busy building out a dashboard in Glance which is turning out pretty cool. I have a short list of services I want to get up and running so I will be working on those over the coming weeks when I'm free.