what should I do with this?

Start new job as a network engineer and I was gifted this old PC. I turned my old gaming PC into a little Ubuntu server. I have a 4tb HDD in my Ubuntu machine, and really just use it for Jellyfin. What should I do with this? It has 2 GPU slots, I guess I could beef this up. Pretty new to the sub so lmk what y’all would do! Should I put my other components into this or just part it out?