This is an amazing game, im absolutely in love with the game and dont want to see it die. Ive come up with an idea for something kind of like a "recruitment drive" that could really help inject some new blood into the game. Now please remember this is simply an idea, and still needs to be fleshed out with help and ideas from the community.
Sales and Specials would be a major appeal for potential players, allow them to get a 20% or even 35% boost to crystals bought during the recruitment drive. Have some of the more popular items on sale at anywhere from 10% - 25% off. This also has the potential to show current players that you care about them.
Discount the first month of access to the P2P server by maybe 10%.
Give everyone (P2P and F2P) a recruitment like and hold a contest, the person with the most recruits through their special link gets 10,000 crystals and 30-day access to the P2P server. Use the IP address of the new accounts so someone cant rig the contest in their favor.
This is just a couple of ideas that i believe could help bring new life into the game, and I would like some other people to come up with ideas of their own and post them here