Next time at your campsite, you should get a villager personality that you are lacking. For me, I have three Normals, no Snooty, so next time I have a camper they will be a Snooty. Hope this helps!
edit: my next camper was Apple, a peppy type so the theory I see online doesn't always work.
Completely understandable, especially if you want all personalities, but I’d advise you to keep Stella... she’s soooo cute and I wish I had her amiibo card!