Customer search related keywords and the keyword positioning is important in ranking in amazon.
Despite relevancy, Amazon places a high importance on the exact keywords used in the search query
Alongside price, availability and sales history text match is a huge ranking factor
how well you optimize your product title and description, you will get higher ranking on the list.
Also customer reviews(The number of satisfied customers you have is a great indicator), amazon sales rank, CTR, using using quality images helps in better listing.
Using bullet points in description helps you to reach long tail keyword searches.
Among all you should keep in mind all the amazon A9 algorithmic factors.