Spend increase
The essential problem is that most firms spend money on defense, which is wasteful since all firms can be targeted equally easily. Instead of building pointless digital fortresses, the money would be better spent on offense: identifying hostile actors and hunting them down. Business and government need to work together to develop a counter-offensive which can more rapidly identify the path an attack has taken and reach the initiator of the attack.
Of course, it's way easier to describe this approach than implement it, and there's a lot of money to be made building pointless defenses in the meantime.