Do you have another hobby? Personally, if I had $100 gift card, I would spend it on furthering my other hobbies - I'd buy a rotating cake stand and mini cupcake tin for my baking hobby, stamp cleaner and hole-punches for my paperwork hobby, and a new tennis racket for bludgeoning my neighb - er, for tennis.
I feel like with Animal Crossing, you already have the game and that's enough to enjoy it. (Vs some other hobbies require other things to enjoy it fully)
Anyway. I'd probably buy a 5th copy and be done with it, then look for other **** to buy. Like other games, or that goddamn Elsa doll Disney sold out of within a month and hasn't ****ing restocked her ever I'M SO ANGRY
/wheeze
Anyway. If you already have a second copy coming, I'd just focus on getting other stuff I like. Like I bought Bayonetta and various other things from Amazon. Older games... [sighs dreamily]