Answer:
A company's strategy affects everyone that works in it, not only upper management. The company's strategy can serve you as a guide that shows what the company expects from you and what you can expect from the company. Every single worker should focus on following the strategy and successfully accomplishing its goals.
If you are a good and efficient employee, you should be able to start advancing on the company's hierarchy levels, and maybe one day it will be you who decides the company's strategy.