Looking for intensive Japanese language courses

Hi, it’s my first time posting here.

I have recently moved to Tokyo from Kyushu for work, and due to visa issues I will be unable to start working on April 1st.

This means I’ll either have to stare at the ceiling, or I can take this time to work on something.

Therefore, I’d like to ask if anyone has a recommendation for a short-term (2-3 weeks max) intensive course for an N2 holder (planning to take N1 in July) to strengthen conversation and business-related vocabulary and expressions, preferably in-person.

Thank you in advance!

by selenin