How to break into snowboard instructor industry in Japan?
As title, says looking for advice on how to break into the snowboarding industry. I have been snowboarding for just over 20 years, and have all my own equipment. I have full right to work in Japan and am flexible with being able to work full season anywhere in Japan, don't mind working 6 days a week. I do have a preference for Nagano area (my actual home is in Kobe) as my in-laws live there, but happy to consider other places if accommodation is not an issue. I'm native English speaker and around N3 in Japanese.
I'm looking at getting my instructor certification this season, however from what little I've been able to find online I either have to pay an extortionate amount to guarantee a job or already have a season of experience under my belt. However most job posts seem to be aimed at people who are coming on a working holiday which I am not. I want to do this yearly if possible. I have experience teaching children as well, as I worked in an afterschool daycare before.
So I guess questions really are, which certification is best (CASI, APSI etc), and how do I go about finding a job once I have said certification? Do I really need a minimum of level 2 license if I don't need a work visa? Would it be possible to get certified and work the same season?
Thanks