Which of the following actions would be most effective for a business to take in order to help them progress towards achieving their content marketing goals?

Personalising content to make each customer feel important, taking into account available data about each individual customer.
Reducing the number of channels used for content marketing to only those channels with the highest referral numbers, thus saving money
Identifying audiences who view their content, and ensuring those specific audiences get targeted in the future, with the aim of increasing sales
Refining their content marketing strategy as they go, taking into account available data and metrics