Final answer:
Northern Trail Outfitters can benefit by using the last purchase date and channel preference of customers to personalize interactions and increase purchase frequency.
Step-by-step explanation:
To increase purchase frequency through personalized customer interactions using Journey Builder, Northern Trail Outfitters (NTO) should consider utilizing last purchase date and channel preference of customers. Having insight into the last purchase date can help NTO to tailor communication based on individual customer purchasing patterns, such as sending re-engagement emails or offers after a certain period of inactivity. Similarly, knowing the customers' preferred channels for communication (e.g., email, SMS, social media) allows NTO to deliver personalized content in a way that is most likely to resonate and induce further purchases.