Review manipulation gets you banned. Here is what works.
1. Amazon Vine
The only legal way to "buy" reviews. Enroll up to 30 units.
2. The "Request a Review" Button
Use automation tools to trigger this official Amazon email. It converts 20% better than custom templates.
3. Product Inserts
Be careful. Do not ask for "5 stars". Ask for "honest feedback". Avoid conditional language (e.g., "If you are happy...").