I wondered what to do with this 2012 Thinkpad I had from my sister. It worked perfectly fine with Fedora and it even had 8GB RAM, so I could probably make it a decent home server. And then I wondered: Do I even need a home server? Being honest with myself, I had to admit I don't need an additional piece of tech and reuse it just because it's wasteful otherwise.
My decision was ultimately to donate it to this organisation that gives impoverished people old but usable laptops. For me a luxury, for them a necessity. Maybe you can also consider this.