Thing is, at the scale that a home server is likely to be providing, you don’t really need an upgrade at all for any of the components except storage and maybe a 2.5gig ethernet card depending on services available.
Also, like the other commenter said: SSDs. SATA ones (unless you have free PCIE lanes then use an m.sata adapter board).
Archer@lemmy.world 6 hours ago
SSDs (Slow Spinny Disks)