You can improve your memory much the same way as you would improve any other ability - practice. The more you use the memory-encoding and retrieval circuits in your brain, the stronger and faster they will become. And exercising your memory is good for your brain activity overall, as memories often include a lot of information that is encoded in various brain regions (e.g., smells, tastes, emotions, thoughts, sights) and so will strengthen connections between brain regions. You can start improving your memory by doing daily memory puzzles, playing games that require you to have focus and memory, and by reading novels that require you to remember slightly more complex plots and characters.