I talk with a good number of sellers who get discouraged because of 'seller saturation' (they find a great product to sell, then a ton of sellers jump in and sell the same product, thus the original seller's listing becomes 'saturated').
I've enjoyed less competition AND higher profits when I combined two or more different products into one newly-created Amazon product (called a 'Bundle'), OR when I've combined multiples of the SAME product (called a 'multi-pack') and created the listing in the Amazon catalog for the first time. In either case, I've been 'first to market' with the multipack or bundle, giving a huge head start over the competition (or many times NO competition)...And the more unique the bundle/multipack, the less change you'll have of any seller jumping on your coattails.
All the "How and Why" info you need is below
Need profit proof? View the below video to see how I made a MUCH bigger profit by bundling (versus selling a standalone item):