I should clarify. When I say filing early, I mean filing before your number is in section C of the VB. I talked to an immigration lawyer who told me that they had had cases where USCIS just accepted early applications, but they had also had cases when USCIS returned the application.
I know it's a risky situation, I just wanted to see if someone had experience with this.
As you said, my number is not even close to becoming current at this point, and my US visa will expire in April. Seeing VB increase by only 700 is very discouraging, and I also know that the embassy in my home country does not even look at DV applications because of the severe backlog.