1) reset the game
2) release a 2 month beta
3) during that beta add tob, and various other pieces of content whilst fixing current content (cox)
4) advertise properly
5) rework the staff team (im not joking when I say this, majority of the staff HAVE to leave/be kicked if you even want to pull 100-300 players. Currently, you get banned for saying "faggot" which is ridiculous.
6) do staff applications, get old staff back who actually did their job.
7) release the game
8) whilst the players are here, dont stop doing updates or else itll die again
9) listen to the above points.

The chance of this happening is very low but it's the only way you'll get over a 100 players (without a player multiplier, like currently).