I don’t think there really were 54k MAUs in the first place. It took me a few goes to find the right instance for me. Through some fedi drama I’ve had to move “home instance” last month. So last month I probably got counted as 2 MAUs.
But this month I’ve only been using this account.
When lemmy.world was having DDoS issues (are they still?) a lot of people made alts or moved completely and those would all be double counted.
Do you have write permission on the file?