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Take dance classes to become a better and more versatile dancer. Invest in a vocal coach to strengthen your singing abilities. Work on your rapping skills to round out your skill set. Practice writing your own music and perfecting well-known songs.
Especially if you don't have much practice dancing yet, look into taking as many different classes as you can. Focus on hip hop and urban dancing. A big part of being a trainee (and hopefully an idol!) is being able to perform exceptionally, and that includes dancing. If you can't take actual classes, use the internet to learn new skills. Even if you're already a great singer, chances are you could still learn something from a coach. If nothing else, they can give you tips to increase your endurance when you perform. If your main skill is dancing, that is okay! But having the ability to sing will increase your odds of getting noticed when you audition to become a trainee. Rapping is an important part of the K-pop lifestyle, and it can also be fun! Listen to more rap music to get an idea of the rhythm and start imitating your favorite artists. If you get caught up on the words, practice tongue twisters to loosen your lips. When you audition, you'll need to perform songs that the producers already know, but when you're a trainee, you'll be working on writing and choreographing your own original music. It's a good idea to work on both aspects of being a performer. Take a music writing class if you can, and spend a lot of time listening to K-pop and watching music videos so you can start emulating popular styles.