It dropped 50% in a few hours and about 60% in 24 hours after losing against Croatia at the FIFA World Cup in penalty shootout.
This seems very reasonable considering that the Brazil Fan Token is a token that has no backing and only relies on the name "Brazil" and demand from supporters of the Brazilian team. When the performance of the Brazilian team gets worse, this will affect the price of this token and vice versa, when the performance of the Brazilian team improves, the price of this token also increases.
Most of the Fan tokens are like this, the price follows the performance of the team, and it seems that these tokens have no future and also do not provide any benefits for their holders. But for people who like to "gamble" this seems to be a suitable token for them.