it may not be the most effective strategy. It’s important to carefully consider the legal implications, competition, supply chain, and customer reviews before deciding to sell a product that is already available on Amazon. Instead, it may be better to focus on creating unique products or improving existing products to offer something new to customers.
From your question it seems like you want to ask that can you sell any item that is already being sold on Amazon so the answer is that it depends on your business model. If you want to sell an item similar to that item you can sell it under a different Brand Name and different packaging and if you want to sell the same item then you need approval from that Brand and then you can continue selling that product.