Not getting sales on Amazon is a common situation. Some questions may help determine some issues.

How much competition do you have? There was a post a year or two ago from a rookie wondering why his phone cases weren’t selling. Even a minor effort put into a search found there were over 10,000 OTHER sellers and many of them were ‘offshore’ and selling for a few cents and using FBA or the deeply discounted shipping costs that they get.

Did you do any test selling on OTHER (less expensive) sites to see if the products would actually sell?

Did you do any price elasticity testing on OTHER (less expensive) sites to see what prices the products would actually sell at?

On AMAZON, did you do any test selling doing FBM to see if the products would actually sell and determine what your costs would be BEFORE trying to do FBA?

On AMAZON, did you do any price elasticity testing to see what prices the products would actually sell at AGAIN before going to FBA?

Jumping immediately into FBA can be a huge mistake for many/most sellers due to the costs involved. If your items do NOT sell you will be paying storage fees FOREVER until you do a withdrawal order. Did you understand that BEFORE you made the decision to go FBA?