If you can do a SERVER MERGE and keep pushing out updates / fixes like that your other versions are receiving, like......
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Seafloor Treasure Hunt
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Ninja Class
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Special Events
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Adding the Missing Headgear Items, Special Cards and Costumes
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Updating 170-180 & 180-200 Maps
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Fixing Endless Tower
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Then people will more likely spend money and stick around, otherwise you are getting less every month.
The people that still play love the aspect of this game and even spend. But notice that IndoRO and RoPH have way better events, content, updates and support.
Please help us out and keep making this game great!