What to do about bots mass downvoting your game?

I noticed my latest game's rating has plummeted  in the last few hours. When I looked at the ratings, I found out that all of the negative ratings were from accounts with nonsense names, all of which were created mere minutes before their rating. They had no posts, no activity whatsoever. I've reported them, but they keep coming. It's really depressing to see my game's rating plunge so much with how much time I spent working on it.

Here are some screenshots to show you what I mean: