So it struck me recently; Michael only kills on Halloween, right? So what the hell does he do for the other 364 days of the year?
Lol!!! Watches jerry springer like the rest of us! You are the father! Michael throws his knife down in disbelief lol
To answer your question accurately you have to look at the separate “official” canon timelines.
H20 Timeline : My favorite for the fact it’s implied Michael doesn’t just kill on Halloween, or in Haddonfield. In the comics, Michael roams the midwest and kills all through the year on occasion, with his favored time of year of course being the season of the dead; Autumn.
Thorn Timeline : Well, from the one year time gap to H4 and H5 he was in a coma, and after the end of H5 it’s implied he was captured and held by the Cult of Thorn for the next few years until he was unleashed to kill Jamie Lloyd and her son. Michael was basically just kept in captivity, or asleep.
2018 Timeline : Sits largely comatose and ideal in Smith’s Grove Sanitarium for four decades. The simplest of all the three.
Hope that answered your question!
I liked what they did with his off season in the RZ movies. He became a wandering vagabond, killing what and when he pleases, stealing food, eating dogs, etc.
I think he’s just more inconspicuous but still stalking and such the rest of year. 
He watches porn, and does his thing.