What is Amazon's strategy for continued growth?

With the size and market share that Amazon already size, their growth rate is getting smaller and smaller.

What could Amazon.com's potential strategy be to continue growing their empire?

Amazon's a platform company. Their future counts on continuing to build new platforms, continuing to grow old ones, and continuing to find synergies between them. Starting with their e-commerce platform, they've identified each component of their businesses that they can cut costs by doing themselves, and bring in new revenue by offering its at-scale operating efficiency as a platform of its own.

They started with shipping and logistics, then web services, now media & entertainment distribution. It's rumored they're rolling out smartphones of their own soon, and I suspect it's more to extend the reach of their content distribution platforms than because they really want to achieve dominance in the consumer electronics market.