Your interchange yard (staging) on the left is also an "industry" or destination to which local industries can ship, and it can "ship" to them via the yard.
So if you treat the layout as if it was linear, this is one possible scenario. West is always to the left as you look at the benchwork, and east is right.
JOB 1: The Interchange run. From the yard, proceed WEST to the interchange with any outbound cars. When returning from the interchange, you must always proceed EAST to the yard. FOr example, the furniture factory and cold storage cannot be serviced directly from the interchange.
JOB 2: Sort cars, service the ice house, stock yard, and slaughter house.
JOB 3: "The Mixed Bag" - a local turn (a train that goes out and back to serve local industries). Proceed WEST from the yard with train. Switch the Freight Depot and Team track. Reassemble train, run around, and return EAST to the yard.
JOB 4: "The Splinter" - similar to the above, but switches the Lumber Yard and Furniture factory.
JOB 5: "The Grocery Bag" - another local that serves the Cold Storage and Co-op.
In these scenarios, you don't really use the continuous running loop, although if you want to simulate distance, you can require that the train go once, twice, or whatever around the loop. (Of course, you can always use it for the therapeutic benefit of waching trains go round and round

)
You might consider adding another track to a few of the industries - e.g an indoor track at the Cold Storage, or an additional track at the furniture factory.
In addition, adding some rules about how fast you can go, or order of cars, or order for switching can add time and enjoyment...! For example, if you have a lumber yard that goes over the tracks, you must use an idler car as the locos are not allowed under the overhang.
I hope that helps. We can discuss renaming/repurposing some of the industries if this does not generate the wanted level of traffic.
Andrew