The term "level up" is a current political buzz-phrase. The Tories have spoken much of how they are going to do this to deprived areas of the UK, and today it came out they're even renaming a department of the government 'Department for Levelling Up, Housing and Communities' (formerly housing and local government).
Prior to this intrusion into politics, this is a term that I only ever encountered in video games. It always struck me very much as a word stolen back into English from Japanese-English. Interestingly, however, checking a history of the term, I do see that it has a history going back quite some way.
https://books.google.com/ngrams/graph?content=%22level+up%22&year_start=1800&year_end=2019&corpus=26&smoothing=3&direct_url=t1%3B%2C%22%20level%20up%20%22%3B%2Cc0#t1%3B%2C%22%20level%20up%20%22%3B%2Cc0
Or try this one.
Does anyone have any insight into the actual history of the term and how it was originally used?
Was it at all similar to its current video-game influenced usage?