Can I improve a language by watching movies?

My Chinese was almost B1 before I left 3 years ago, when I was gone for 2 years, I totally forgot everything I learned and and went back to a beginner level, I can barely talk well enough now.

I now have TV in my new apartment, I bought a package for Chinese channels and I wonder if it is going to help me improve Chinese again, If I start watching movies in Chinese?

Can I improve a language by watching movies?
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