Subscribers rarely cancel over one dramatic event. They leave because expectations were not met, because they stopped feeling seen, or simply because the page went quiet and they forgot why they were paying. Naming the real reasons is the first step, and your churn numbers will point at most of them — reading those is covered in Analytics & Optimization.
Separate the churn you can control from the churn you cannot. Some cancellations are seasonal or financial and are not your fault; many more are preventable with consistency and contact. An honest price and promise set up front prevents the disappointment that drives a lot of early cancellations.