We all know how hard those sport stars and entertainers practice for the actual match or performance. No matter how established that person is in their field, they cannot escape from this essential part of their preparation.
Similarly, if you were to learn a new skill, and you repeat the process many times, you are bound to eventually master it. That also stands true when learning a new language.
Another form of repetition is the imprinting of your subconscious mind. When you repeatedly proclaim something, even if you do not initially believe it, there is a high chance that you will end up believing it to be true. Sounds a little weird but try it. Well, do not just say it like that, but with all of your emotions and actions. Do it enough, and you’ll might end up advocating this ‘weird’ method yourself.