For Supcom FA the only way to get new players is through current players telling their friends about the game. The internet(google) only promotes things that are paid for, so if you are still living with the illusion that whatever is popular is what the masses have chosen to be popular, you need to wake up.
Word of mouth has exponential character, the more people you have playing, the more people you have talking, the more people you have hearing and the more people you have coming in.
This should be very intuitive to the average supcom FA player, who understands the value of early mass and must understand that if you let your first engineer sit idly by with no orders you are likely to be in a huge hole against the enemy.
You the players are these early engineers, dont' sit idly by, promote the game and later when we have conquered the RTS world, we won't send you to the front lines to reclaim wrecks, but leave you under the shields assisting the nukes.