First, do keyword research using Amazon Brand Analytics or other 3rd party tools like Helium 10, Jungle Scout, Merchatword, etc. Then do a competitor’s analysis that how they wrote titles, bullet points, and descriptions. If you are brand registered use A+ content instead of a simple description.
Start writing your title with your brand name and add 3 to 4 super-relevant keywords with high search volume in the title. Your title should be under 200 characters.
For the bullet points add material in the first bullet, in the next 3 bullets ad features of the product, and in 5th bullet write care, etc. And try to use keywords in them. Each bullet point must be lower than 500 characters.