Don't give up!
Keep trying to motivate your players to play by doing events, being active ingame and support them as much as possible word wise, anything beyond that isn't good. And would lead to players believing you'd be biased.
Also try to get them to write reviews. The vote 4 points system is alright but in my opinion over valued, still having it is I suppose nowadays a standard. Unless you have +1000 players then of course you can just remove it. You always have to remember the times when players have vacation and keep trying, your never going to just get 100 players in 1 day or even in a week, or i dare say a month, it takes time and unless you have a super good PR, and do super costly advertisements it'll take time. Be sure to be on, and players will see that, recognize that and therefore thank you by being on and active. Trying to get them involved in the forum community is the best to keep the community alive, sharing info and growing as well.