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Lemmy Instance in Proxmox
(lemmy.ml)
Docker inside LXC can be a pain, it's much easier to run it in a VM, and you usually get better performance anyways.
A Debian VM uses like 25MB of RAM for itself, so there's very minimal overhead. Plus VMs are more portable if that is something you need.
Since you're going to use cloudflare for DNS, you can just flip the switch on your subdomain and pass everything through cloudflare which will hide your real IP, and provide some protection against bots.
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.