All of the above, if the data is there, can be arranged pretty quickly. Good brainstorming, making hypotheses, putting together and framing a team. Now it comes to work. Actually executing what you have come up with.
Two factors of growth hacking come back here, namely mindset and team.
Growth hacking gata for short sprints. That means that there is a full focus on the hypothesis and the test for this short period of time. That also means that you let go of all other marketing tasks a bit.
It can also mean that you focus a little less on design or whether the correct emails are being sent with the correct sender and title for a short period of time.
I often find out that many companies find this extremely difficult. They have found a data breach, know how to deal with it, but then have difficulty letting go of the standard everyday process.
The specialists know what to do, but the manager is often the bottleneck and that is why I say that mindset is the biggest factor in this process.