I am a Korean resident in the United States, and I am curious about ways to improve my Korean vocabulary skills.

I am a Korean who spends most of my time living in the United States. Perhaps because of that, I feel that my Korean language skills are somewhat lacking. I understand the grammar to some extent, but my vocabulary is quite limited, making it difficult to have conversations. I consistently use Korean through conversations with my mother, but learning new words is not easy. In particular, I often lack understanding of terms related to specific regions or cultures in Korea. Is there an effective way to expand my Korean vocabulary or any recommended materials? It would be very helpful if others could share their experiences on how they improved their vocabulary. Thank you!