this is adorable awdshdjkahsdkjhdsd. what is the maximum amount of cats you can have at once? I adopted 4 and strays wont spawn anymore.
The limit of visiting kitties is based on how many toys (and scratching posts) you have, so the more toys you buy the more kitties can be present! There are diminishing returns though so it takes a lot of toys to increase the limit, eventually (though, at only 4 kitties, you should only need to buy 1 more toy for another kitty to show up!)
Also, make sure you didn’t close the gate by mistake, and make sure you leave food out, or kitties won’t visit!