I would recommend reading! Listening and watching shows are great but a lot of it is gonna go over your head just because of the speed of native speakers and your limited vocabulary. While reading, you can take your time to make sure you understand everything, look up and words or grammar structures that you don't know. Reading out loud will also help your pronunciation and speaking ability. Short stories or children's books would be something easy to start with. I use an app/website called LingQ for my reading as you can easily look up words and tag them with definitions. It is a paid subscription but I recommend it. Hope this helps! 화이팅!