Joanna 正在制定赢回策略，专注于让之前购买过、现在不再使用其品牌的客户实现转化。建议使用哪种定向方法？

Contact Targeting is the most effective method for a win-back strategy because it allows Joanna to upload a list of past customers (contacts) directly to LinkedIn. This enables her to specifically target individuals who have previously purchased from her brand but are no longer active, making the campaign highly relevant and personalized. Company Targeting, on the other hand, focuses on reaching employees of specific companies, which is less precise for a win-back strategy aimed at individual past customers. While some past customers might still work at the same companies, Company Targeting doesn't guarantee reaching the specific individuals who previously made a purchase.