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The best way to do that is to start a complex project on your own. This will force you to learn advanced techniques and deepen your knowledge on the language and the different libraries available.
From now on, you choose what to learn and what topic you specialize on.
Some projects on different topics:
-AI and machine learning -- math and neural networks
-Create a full website
-Create graphic interfaces/games/utilities -- guis and engines
-Data analysis -- math and data