How should Amazon sellers choose products to avoid excess inventory?

When I first started on Amazon, my biggest loss wasn't from ads, but from stocking up too much at the beginning. Later, I started looking at negative reviews, return points, and the growth rate of reviews for similar products, and then tested the conversion of 2-3 keywords in small batches. If it performs well, I restock; if it doesn't, I clear it out quickly. The biggest fear in platform…