I also think a big part of it is how active users are counted. Saw in a different thread that it only counts accounts who have commented or posted in the last month. Well… I browse and vote on probably an average of 30-50 posts and many of their comments every single day, but the last comment I left was over a month ago.
I also wonder if the active user count is counting people who made multiple accounts across different instances and was therefore always massively overinflated to begin with. I have 5 lemmy accounts - one on lemmy.world when I first joined, one on lemmynsfw for happy fun times, and 3 more trying to find a different instance with the de federation policy and hoster that I wanted after lemmy.world was going through their ddos downtime issue.
Not the person you responded to and its been a while since I’ve done it, but I’m pretty sure you can just open the file with notepad (or TextEdit on Mac), scroll down to the timestamp, make the changes, and save the file.