So I just resubscribed to Google Play music and it gave me 2 months subscription for free!!!
I'd only been expired for about 3 months so not that long really. Hopefully it works for others. I just went to the page and clicked subscribe and then it popped up the 2 months free message so I followed with that. Of course remember once you subscribe you can cancel it and still use it for the 2 months.
All the best!