Can that be automated? I am assuming that when you say unfollow new accounts it means from the ssb-pub (command line), right?

I'm probably going to write a cron-job for a bunch of things including this one yeah. considering most of the code runs on JS i asume i can probably get a list of users that the pub started following x months ago and then post an unfollow message using the sbot library.
I'll run without it first though, see where it goes.