Lots of choices for sure. I haven’t built a PC in years but I’d start with looking at the requirements for the Minecraft & Jellyfin server, maybe shoot a bit higher to future-proof the build, then browse PC part picker builds to find combos that have worked well for others?
Best of luck to you.
Some people have zero respect for their own lives, and by extension, any living thing. Money insidiously affects all, whether you’re a have or a have not.
We must try our best to nurture and understand our world instead of “conquering” it.