The amount you can make from selling on Amazon in a month will vary depending on a variety of factors. These factors include the type of product, competitors, market demand, and sales strategy. Some successful sellers may make thousands of dollars or more per month, while others may only make a few hundred dollars. To be successful on Amazon, you need to invest time and energy to research the market, optimize your product listings, provide excellent customer service, and actively promote your products. In addition, building a good brand reputation and accumulating a loyal customer base are also keys to success.