tom nook not upgrading for me

There are already a billion topics on this.

No one knows why he isn't upgrading for certain people, we're all assuming that he does this randomly.
 
Theory that is most probably correct and I will consider it to be true until there's proof of it not being true:

Once you've bought 25,000 bells worth of stuff from nook you have to wait a set amount of days before he upgrades, example being 1-7 days. Some would be more lucky than others and get it on the 1st day, while others would have to wait a whole week.
 
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