Okay, let's analyse this to get a good feel of how advertisement would affect this game.

We get the funds in, let's say, 1 month from now and launch an advertisement. The game gets around 20k new players that attempt to play this game and flood the servers. What happens? Beginner servers will be full, raising the max clients will crash the servers, new players won't know how to play the game and 90% will quit of frustration because of the learning curve and almost no guidance in terms of tutorials. After a month or two all the people who got to game through advertisement will be long gone and like 0.01% will stick around because they actually get some enjoyment in the game.

The current state of the game is not suitable for new players, current servers are accustomed to rough average of daily amount of players so the new wave would destroy the hosting server, it does not have any successful rewarding system which would keep players engaged and motivate them to keep playing the game and finally it still has many bugs and crashes up to this day as it can be seen in technical support board.

Before launching such project as advertisement you have to understand that the advertisement itself is only around 5% of all process, there is a lot of preparation and planning that has to go into it if you want the advertisement to actually be effective and worth the money. The current state of the game is not fit for advertisement so project to fix up the game and make it beginner friendly would take months to plan let alone execute it. In addition to that sever upgrades would be inevitable to support the wave of new players and this could even cost more than the advertisement itself.