Strategy is not a silver bullet. It is not that thing that you find and can use forever without ever changing it. It is not a mathematical solution where there can only be one answer. The context is always shifting, meaning that what led you to success yesterday, may not lead you to success today.
There is a common misconception that, because SMEs have fewer resources at their disposal than large companies, this will stifle their ability to innovate. While it is true that SMEs may not have the resources of large corporates, the streamlined nature of most SMEs means that things can be done without much bureaucracy - which is actually an enormous advantage to innovation.