Yes actively flying part 135 in 1900. I had CFI,II, and MEI at one point
Do a CFII renewal. Should be the easiest.
You can't "renew" if you've let them lapse. You have to re-instate.
The FBo is picking up more students at one of the layovers and approached me about if I was interested in teaching. I would only fly a few hours a week. It still a few hundred bucks a week of cash is spanking my interest.