The thing is, all things considered, that what would be the most specific reason possible for her to set sail with Luffy?
It seems like wanting to see the world will continue to be a part of her motivation, but I think it’s clear that wano will make her realize how important the SHs are like Pedro said, so her dream will probably be to help them bring about the dawn of the world.
oda is setting up characters like momo and luffy to be important in bringing about the dawn, which is why we’ve been seeing characters like Pedro / Yamato putting their faith into each of them. Carrot will inherit Pedro’s will and put her faith into luffy, while Yamato will do the same with momo (which is why, while she’s going to be important, it doesn’t seem like she’s going to join imo)
Also Oda has continued to group carrot with the other SHs and has made it obvious that she likes them/has chemistry with them so I don’t think in makes sense for her to stay in Zou / wano