[Chitose area] Advice on improving my Japanese.

So I moved to Chitose around 3 weeks ago for a job at a Japanese company.

It's not perfect but more or less OK, but I realized that my Japanese skills is in fact more lacking than I thought. No one's pressuring me to improve my Japanese, but I feel like it's something I need to get better at to excel at my job…

For context, I'm somewhere between N3 and N2 level.

I'm particularly struggling with speaking & teinei business Japanese for things like E-mails and telephone calls.

Anyway, long story short, does anyone have any Japanese classes recommendation in the Chitose area? The only one I could find was JLLSC but I figured I'd try asking around here too. I prefer a sit-in class where I actually have to go there, but I'm not 100% against online classrooms.

Thank you in advance!

by After-Night