Cable running across top of trusses
If you have, or plan to have, an appropriate amount of insulation in the attic, running wires or cables down low hides them and you won’t easily find them later. If they’re up high they may be in the way, but I think the ones you show in your picture are high enough that they’re well out of the way. Do either high or low; don’t do anything in between that will make it hard to move around the attic.
You also mentioned the green cable has nothing on either end. If that’s the case, why not just remove it?