@gskger You're here. You know the answer. Put in some more memory and a 2TB NVMe and run XCP! See what you can do with it. Dedicate an outside and inside interface and have a DMZ for guest net and more.
I have a system like this (a little faster i7 CPU, 64G, 2x2TB NVMe, 2T SATA) and I run lots of stuff on it including: BT server, asterisk, DNS server, NTP server, XO, Win10, test VMs, ZM for cameras, and more. I turned off a whole bunch of old hardware.