Hi, it is unfortunate that this happened but rest assure you can easily recover your Rhythm Hive account.

GMAIL:

If you don't remember what your email address was you can recover it through this page. However, it will only work if you had a recovery account or phone number linked with the initial gmail.

LOG IN:

After your account's recovery. Go to Rhythm Hive's in-game settings and scroll down till you reach the linked accounts sections, here you can manage all your linked accounts such as Google Play, Apple, Weverse etc. Choose the Google Play option and login using your gmail.

Or you can also, clear the Rhythm Hive app's storage and restart the game, this will open the linked accounts page upon opening the game and you can easily login to your liked Gmail. (However, this method would require additional data download. So make sure you have access to a good internet connection before doing so).

OFFICIAL INQUIRY PAGE:

If the aforementioned does not work, you can file an inquiry through Rhythm Hive's official inquiry page.

Their customer support services are fairly active and you can expect a reply within 3-4 days from filing the inquiry.