"Unable to restore your chats from this backup" (from Google Drive) error

After updating my WhatsApp app yesterday. It did something and deleted all my chat history. Leaving only groups left. I still have my Google Drive backup. To restore it, I uninstalled my WhatsApp app and reinstalled it again. Then, I tried to log in and restore my data. Then I saw the "unable to restore your chats from this backup" error. And it also said 0 messages recovered?
Things that i tried:
-Removing 2 fa in my Google account
-Logging out from my Google account and logging in again.
-Deactivating my 2nd SIM card
-Restarting my phone
-Deleting WhatsApp data and logging in.
-Gave all the permissions to both WhatsApp and Google Drive
-I saw someone recommended to press home button when it stucks at a percentage then reboot the phone. I also did this too. But it didn't work as well.

I tried everything to restore my backup from Google Drive to my WhatsApp account as i mentioned above. And none of them worked. I also emailed to the support but as you can guess. They didn't help at all.
I can't use whatsapp since yesterday because if it makes another backup (which will be empty since i have no messages now) the old backup will be lost. And as far as i know, there isn't any way to recover old backups.
Please help me i have many messages and they are quite important.