Not to tut my own horn, if you are familiar or curious about docker this could be something for your “spare”:
I would say if you don’t know docker, it can be a time consuming wormhole of “fun?”. Check it out, i have a small web-based accounting software running on my V4, and a few other services.
Maybe it’s enough for a PiHole which would provide ad blocking, DNS over HTTPS (if you add dnscrypt-proxy/cloudflared), DHCP? I’m using it on my server for years now, love that I’m mostly ad-free at home on all devices.