Basically the title, you need to use the skills you have now and be a productive member of society.
I don’t mean go back and show the wheel or try invent germ theory etc.
For example I’m a mechanic i think I could go back to the late 1800s and still fix and repair engines and steam engines.
Maybe even take that knowledge further back and work on the first industrial machines in the late 1700s but that’s about it.
If there’s one thing I know about chefs is that they’re still able to make a banger of a dish while out of half the ingredients, the oven is broken so they’re using a blowtorch, and Joey the kitchen bitch needs saved from getting eaten by the industrial mixer. I’m sure they’ll figure out using a wood stove while taking out their anger towards front of house by butchering a pig