Big exploit available with the EA Play codes. There was a thread on HUKD, but some people can't follow instructions and now the thread is under review
You need the old Xbox app for it to work (i.e. not the latest update). If you're on Android, you can always uninstall the latest version and then grab the old one from somewhere like APKMirror. Roll the date back on your phone by a couple of days. Buy a 12 month EA Play code (£16.85 on ShopTo). Redeem via the app. It will throw up an error, but the code actually does go through, and it gives you 12 months of GPU!
I've just done it. Could only do one though as my current sub was due to end 18/2/2022. It's now 18/2/2023!
This can also be done via the windows app, same procedure of setting your pc back one day.