If you linked an email, you can recover your account yourself: see "How do I keep my progress on a new phone?".
If not, the receipt for any purchase you made in Golden Roll shows that the account is yours:
- App Store: the receipt email from Apple shows an Order ID, such as MLJWGFM7QW.
- Google Play: the receipt email from Google Play shows an order number that starts with GPA.
Forward that email to support@greenergrass.company from the address it was sent to, and tell us your player name. You can also start in Settings → Support with the Order ID or order number; we will then ask you for the receipt. When we have found your account, we send you a code to enter under Settings → Account → Recover your account.
Without a purchase, we may not be able to confirm that an account is yours. Once you are back in, link an email in Settings → Account, so next time you can recover it yourself.