A treble damages multiplier with criminal charges and mandatory minimum sentences in the decades would be a rather effective deterrent. A breach can be just as devastating to someone as losing a partner or parent to senseless violence and should be punished in proportion to the number of victims. Fines are ineffective. There needs to be life sentences and company dissolution for incidents like Equifax.
High penalties are irrelevant when people don't expect to get caught. They often make things worse by creating a "no snitching" culture because the disproportional penalties are seen as unfair by would-be informants who are then less inclined to cooperate.