Is Japanese School worth it?

For context, I've been here 7 years for uni and my Japanese is just not good enough. Its been one of my main barriers to finding a job.

I can, however, speak perfectly fluent conversational Japanese, so its not like I'd be going from zero. I just have really bad vocabulary and my business Japanese is not that good. I can talk to people in Japanese, and work okay in Japanese, but definitely not sit in meetings and discuss excecutive level decisions.

For that reason, I feel like going to a full on Japanese school for a year may not be worth it. In this situation, what do you guys usually do? An intensive course for three months?

TL;DR: Japanese is good, but not good enough – what kind of lessons should I be taking that is worth the best value?