I once had a similar problem when I accidentally deleted google cookies and could no longer log in to Gmail, even though I had the correct login data, and I also did not have a backup e-mail/SMS set up. Fortunately, I was able to fix the problem by restarting my modem and with a new IP address I was able to log in.
You are in a much more difficult situation because you obviously don't have access to the location/device you used before, and according to what I found online, the chances of getting your account back are really minimal. Maybe someone has a lesser-known method that really works, but if you haven't already, I suggest you read what is written on the following link :
There are a variety of potential questions the account recovery process may ask, but most of the them are based on having a pre-configured recovery e-mail address and phone number on the account. If these are not available (never configured, gone out-of-date, changed by a hacker) the number of questions available may be very limited making it hard to prove ownership of the account. In summary, if you can not recover the account using the provided process, it may be lost. There are no other account recovery options available.
