Over the Hill Professor

I'm hoping old-timers can help me here: I've been teaching for 20 years on a 3-year renewable Professor visa. I just renewed this month, but I also turned 70 and the 3 unis I'm at are retiring me. It seems a fairly hard rule: you're out of the university system at 70. 10 years ago I was also teaching ESL on this Professor visa, and I'm shocked to learn that the Professor lane has narrowed substantially to only unis, senmon gakko, etc. Have these new restrictions been implemented recently? If I can't get anymore work, but have a good 3 years of validity, am I supposed to go back to immigration and change the visa to Humanities? Really, I'm not sure what to do. Now, I'm just hoping some senmon gakko or Junior college that doesn't mind a sprite 70-year-old will come through. Still wanna work part-time another 5 years. Any suggestions?

by ImaginationStill830