After reaching the B2 level of English, most business English students tend to not want to pursue learning the language any further. As students reach this intermediate level of English, they understand most of how to express themselves and communicate with others. This makes them not want to achieve the C1 level of English, even though the CEFR describes the learners of C1 as proficient users of the language. 

C1 level students are well-versed with various nuances of the English language and are more adept at working in international environments.

So, how you can encourage your students to pursue this level and acknowledge the benefits in their own lives and career? Here are a few tips to help you get your students passionate about reaching C1 level of English:
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https://www.engmates.com/blog/spoken-english/9-ways-get-students-learn-advanced-english/