We can't help you with this, we don't save such info as Email, we just let you log into RR using your already existing social/google account. You can try to login with different emails and guess the right one, we won't ban you for simple creation of 3-4 empty accounts above allowed 2. Just don't use any accounts you've created this way or they will get automatically banned without the possibility of getting unbanned.
TLDR:
- We don't store your email, we can't tell you what email you were using for playing RR
- If you lost access to your login account (vk, google, facebook) or removed it, we can't help you