I'm currently editing the 50K that I wrote in NaNo. However, I'm not wielding a scalpel, or even a lancet. I'm busy cramming more words in to cover the awkward "And Lo! a miracle occurs" holes in the plot, simply because I focussed on writing 50K words. Word count now stands at 59K and I suspect it might (just like COVID) gallop ever higher.
Editing is being done on a two-pronged attack. Firstly, go through the text with Grammarly, removing grammar mistakes. Secondly, use ProWritingAid to see what that throws up if Grammarly has given a clean bill of health. Thirdly, make sure my characters have more of a "face". Their words are on the page, but any descriptions are sparse, so need fleshing out.