No, i'm afraid we can't help you with that.
Because it's not easy for us to do this on technical side, we have to verify if you're really an owner of the account you want to transfer, more accounts we transfer, more people come and ask about this same thing, it's easier and more transparent for us to say "no" once and for all.
But you did transfer accounts in the past!
Yes, you're absolutely right, we did, but stopped doing it since summer 2018.
So, if my Facebook or VK or Google account gets blocked or closed, i won't be able to play RR after that?
Yep, so please, set up 2FA in order to make your account more secure.