You have my admiration, turning down something so cute as those animals takes a lot!
Well, I'm definitely not someone competent to talk about setting boundaries, I don't remember any successful attempt to set some in the past few months, but on the other hand, there weren't many attempts to begin with. (But that's definitely just because I've never played Animal Crossing
)
But I think that for many people the problem is to acknowledge that they deserve to have boundaries, that they deserve to be in a relationships that make everyone involved feel happy and safe, and whenever there are two or more people involved, to achieve that, they always need some boundaries and communicating about them. Because we aren't all some clons of each other, we are all unique and have our own unique wants and needs. But way too many people feel like there are asking too much by saying what they need, but when someone around them asks for the same or even much more, they don't ever raise an eyebrow and accept others without hesitating for only one second.
So I found helpful to take notice of when and how people around me establish boundaries with me or between each other and remind myself that noone including me questiones or doubts what the person asked for, noone thinks that they are annoying or selfish for wanting a boundary! And if we don't view other people like this, why would anyone think that I am too much for asking for something?
I know, it's not easy to battle our minds and make ourselves believe that we deserve boundaries and happiness just like we believe everybody else does, but looking at it from this angle is, at least in my opinion, a good way to start.