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22 Examples of Customer Retention Strategies That Work
https://blog.hubspot.com/service/customer-retention-strategies4 simple strategies for improving customer retention
https://delighted.com/blog/improving-customer-retention-strategies장기적 관점의 리텐션 마케팅 사례 4가지 - HelloDigital
https://www.hellodigital.kr/blog/retention-tools-for-long-term-success/떠날 수 없는 서비스를 만드는, 리텐션 마케팅 방법 4가지 | 요즘IT
https://yozm.wishket.com/magazine/detail/115/