A model can have as many Fansly accounts as she needs. There are no restrictions.
Here is the official response from the service support:

Why might you need multiple Fansley accounts?
For example, on OnlyFans there is a popular scheme - create 2 accounts, 1 free, 1 paid. The free account posts simple content, while the paid account posts more explicit/exclusive content.
On Fansly, an account can be both free and paid. The account itself is free, but fans have access to Tiers. Therefore, there is no need to implement a scheme similar to OnlyFans.
- Fansly gives new accounts an FYP boost - additional organic traffic (remember about Cargo Cult in FYP).
- You abandoned one account and want to create a new one. The positioning of the model has changed.
- Different managers, different agencies maintain different profiles.
- You want to create a separate image of the model, take a separate niche with a separate target audience.
- You use 1 account for the SFS / Drop promotion method, respectively, your profile wall is littered with posts from other models and you need a separate clean account.



