If you have over 200 followers, then you can apply for the Amazon Influencer Program. However, it's better to build a follower count of at least 1000 to increase your chances of getting selected.
At the end of the day, it's Amazon’s decision, but they of course want more influencers in their program. They not only consider the follower count but a variety of other social engagement metrics, as well.
If you don’t get accepted on your first application, keep creating more content and try again!