Hardware upgrade for multiple simultaneous streams

I currently have an old pc running my jellyfin server with ryzen 5500, old nvidia gpu (I want to say 1660? But not 100%) me and my roomate use it within the network no problem but if either of us leave we can’t both watch at the same time. I added an ssd and moved some more commonly accessed media to that but I doubt that was the problem. Any advice is appreciated I don’t know what I don’t know