Take it to an electronics recycling center. Seriously.
If you already have a homelab, you plan to replace it, you don’t want to repair it, and you don’t have an obvious use case for another machine (it’s just another computer; you either have the need for another computer or you don’t), then holding onto it is just hoarding.
Same here (well, different model–26k and 87W–but same strategy). Even just as a backup in case of unexpected travel hiccups, a large (airline approved) PD-capable battery back is very handy to have. I never worry about finding an outlet in an aircraft or airport, and I’ve spent my fair share of time stranded in transit.