I've been working on setting up a colocated proxmox cluster because running a ton of things on various pi's is a royal pain over time (also I sleep a lot better at night with this setup!).

My node (almost 5 years old) is the last thing to migrate from a Pi, but I've held off because it still works fine...better, faster, and more reliable than LSP wallets for sure. 1GB is very likely going to run out this year though if I had to bet on it.

Get an old laptop. Corporate ones are cheap amd it doesn't need to be a recent model by a longshot. My company used to let me keep their hardware whenever they upgraded them for me every couple years, I would just ask, and they'd yank the drive for data security and let me take the rest, so I had a few laying around collecting dust 😎