I try this "Follow the steps shown below if the message "Invalid google login account" appears. This can happen when the Google Play app asks for permission, and asks you to select an account when running the Black Desert Mobile app:

1. Tap More (...) in the top right corner after running the Google Play game App.
2. Settings > Turn ON [Automatically sign in to supported games]"

It did not help. How else can I log in to my account ?.

Just change the server. On You might be playing on Europe (Asia/America) server, but there is more of these.
For example: I was playing on Velia(Europe), but didn't notice that I chose Balenos(Europe).
Just change it and play on 😉.