Your brain is very powerful. It has a large capacity, but much like a muscle, if not challenged, would not increase the performance when needed. In order to train your brain, you first have to check how you learn. Humans learn by involving all five senses. Think about it. If you want to improve your mind performance then you can check out https://www.thebusinessbrain.co.uk/.
By involving all of your senses in the learning process, you engage your entire brain. In essence, you give exercise and perform better. You can see where we're going here. The end result of the brain that is involved in capacity is a better memory. Our brain needs rest to strengthen for peak performance, so do not miss out on hours of sleep!
Your brain can be trained to use a technique that involves all the senses at one point or another. It's not about memorizing a deck of cards, for example. Train your brain to use its full potential is the best memory improvement techniques, because the memory capacity comes from all of your senses. Using only one hand, for example, a sense of hearing by listening to a CD memory tutorial is not enough. You can get more information about it via various online resources.