it’s entirely job dependent, a grocery store worker can’t just decide they will not work one of the days anymore because the store needs to be open. but they work in shifts and different days already.
There will also be white collar jobs that can’t just move to a different schedule, like support needs to be everyday regardless.
and if you are a software engineer there is a good chance you are already working remote and if you are good enough you are only working the days you want to.