My number 1 strategy that has been rock solid for almost 20 years is to always strive to be brilliant at the basics. If you cover all of the basics and cover them very well, it doesnt matter what kind of kinks and curves amazon drops in your path as you will be rock solid. When your item fades, you will see it coming and already have the next big thing in process. In terms of amazon, the basics boil down to one function and all it entails: optimize, test, measure, adjust, wash rinse, repeat. Pay close attention to the ever-changing standards. The majority of sellers are too lazy to do this thoroughly. If you are not one of them, you are ahead of the pack. If you cannot comfortably look at the listings appearing ahead of you in search results and identify the things they do better than you to rank higher, you need to keep learning. The goal is to always be improving and surpassing the guy in front of you.