A win-back approach is much more profitable (about 6 times) than acquiring brand new customers, also consider that it takes
To finetune your churn analysis, you can create a new attribute, to dispatch your churn clients in 3 types:
Active churn: the main part of your churn customers
Happy churn: (a subset of active churn) happy customers who churn forced by an external reason from them (ex: company is bought by another Group, etc.)
Passive churn: credit card issues...
Several churned customers can be win-backed or at least contacted back, for example:
the ones with budget issues
the ones who were expecting a feature that have been developed and pushed in Production.