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.
I could possibly be a scribe? I took Latin classes ages ago - and most of the ancient scribes’ work was just copying an existing copy of the Bible.
I’m decent at philosophy but terrible at Ancient Greek so that’s out.
I’m pretty decent at basic/intermediate chemistry but that’s pretty modern. Same with basic life support.
Arguably, a lot of people are missing just how far back the very basic skills of reading and writing ANY language fluently will take you.
All ya gotta do is transalchemutate lead into gold