I thought I'd share my experience with PCOS and coming off the pill and what I've done to get a regular cycle back.
I came off the pill January 2019, after being on it for around 10 years. I had already been predicting my periods with a tracker on my phone, and for that month and about 2/3 months afterwards my periods were regular (for me anyway, I'm around 5 weeks apart rather than 4). Then they suddenly stopped. I didn't want to go back onto the pill so researched ways in which to bring them back naturally. Apart from a good diet and regular exercise, it was suggested vitamins etc.
I started taking Inositol Powder, once a day in the morning in my water, and my periods have been regular ever since (about 5 months now). I know this isn't a miracle cure or anything and there's always a chance my periods could stop again, but hopefully this helps someone who isn't sure where to start!