If your product lacks reviews and fails to rank within a week using a specific keyword, it is recommended to place five scheduled orders for Reviews and/or Ratings with Giveaways orders using that keyword. This increases the social proof for your listing and demonstrates to Amazon that there are at least five orders made for that keyword. As a result,

Amazon will be able to confirm the connection between the keyword and your ASIN, which would justify its promotion to a higher rank.