I've discovered that I really enjoy the idea of protagonists with contemporary/futuristic knowledge going to primitive places and uplifting their knowledge of tech/tactics. The tech base upgrade makes for entertaining analogue to a training montage. Also known as Stranded with Edison (https://tvtropes.org/pmwiki/pmwiki.php/Main/StrandedWithEdison), as a trope.
Lots of examples of it in sci-fi, the Empire of Man series did it very well, it's the foundation of the Destroyermen series, 1632 is another one (shame that's kind of stalled).
There aren't a lot of books on the tropes page, though. What other examples have people come across that are worth checking out? Bonus points if it isn't woke (with they/them characters shoehorned into the place).
It's a pretty major theme in A Fire Upon the Deep. Which also happens to be a great book in general and not in any way wokey.