I feel like my Korean skills have actually gotten worse. Is it just an adjustment period?

Do you feel like your Korean language skills have actually regressed during the semester in Korea? As a student currently enrolled in level 3 at Sogang University, I feel that my speaking ability has decreased compared to the confidence I had at level 5 at Yonsei University. At Yonsei, I had to communicate with Japanese and Chinese students without using English, which allowed me to use Korean a lot. However, in my current class at Sogang, there are many Western friends who use English, so it seems that the frequency of using Korean has decreased. I wonder if this environmental difference affects Korean language skills. In particular, I would like to know if a situation arises where students remain at the same level and do not develop together. I am trying to improve my Korean skills by utilizing language exchange meetings and increasing conversations with native speakers. Is there anyone who can share experiences or advice related to this?