Self-hosted server specs

Hello, I'm looking into upgrading (theseus ship'ing) a server I recently setup at home on old hardware. Sorry if this is the wrong place to ask, if it is can anyone point me in the right direction?

My current hardware is:
CPU: amd fx-6300
GPU: gtx 750-ti
RAM: 2x4gb ddr3 kingston hyperx fury
MOBO: Asus M5A78L-M PLUS/USB3 Micro ATX AM3+ Motherboard
PSU: Silverstone SFX 450 W 80+ Bronze Certified SFX Power Supply

I'm considering of upgrading to:
CPU: intel core i5 14400
RAM: kingston fury 2x16gb ddr4 3600mhz
MOBO: MSI PRO H610M-G DDR4 Micro-ATX LGA 1700 (still not sure on this mobo)

I want to re-use the same case that I'm not sure the model of, and whatever else inside the desktop I can.

My question is whether these are the right parts to upgrade to, or if I should go for the i5 14600k or a different CPU/mobo

In terms of games the server will generally be for modded minecraft (not too many mods to start but maybe some more intensive modpacks) so I wanted to upgrade to a CPU with good single thread performance, for 2-5 players I think. A (potentially silly) concern of mine is just longevity and ability to upgrade in the future from this without needing to replace all of it.

I'd like to spend as little as I can for the most of course, I also am conscious of overall power consumption from the upgrade. It's also running on ubuntu 24.04.2
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