Keyword Sets

I work with Keyword Sets (to make keywording faster). I have developed 20 keyword sets in Lightroom Classic. When I update Lightroom Classic, I lose my keyword sets. I am trying to export (and import) keyword sets. Is this possible? I notice in my files that the three default keyword sets are in the program files (Users>Owner>AppData>Roaming>Adobe>Lightroom>Keyword Sets) but I don't see the ones that I've developed. I have also tried to modify the default sets and see if I can save the new set that way, but it won't work.

How do I include my unique keyword sets in the file listed above? How do I back them up rather than recreating them when I update my software? Thanks for any and all help!