Unlimited time and resources? I'd try to tackle the global security issues related to advanced cyberattack. It's such a complex problem I don't even know if it'

Unlimited time and resources? I'd try to tackle the global security issues related to advanced cyberattack. It's such a complex problem I don't even know if it's possible, but it would require hardening software update servers, networks, and utilities (especially electrical power distribution) to the point where a single bad Windows update doesn't take out the economy.