A way to get new members into the game and other problems.
I will risk being blocked for spamming again, by raising a suggestion I have made before.
If Plarium in their infinite wisdom would deign to publicise the games on Microsoft Store, that could bring in new members. There are many free software's and games publicised there. In fairness your marketing department is worse than useless, they should have been looking for alternative ways of publicising your games. But then it may take somebody like myself with a qualification in marketing and business management to point out their flaws.
Let's face it. Everybody knows the game is dying. We all know why, it is overloaded with extra's that are not needed to make the game fun. It is top heavy, meaning that people who spend maney are always at an adavantage. Non-coiners are always at a disadvantage. You make additions to the game, not thinking about how much extra time players need to do them. Most players do not play those sort of hours, so can not achieve decent results.
Your own page states, that the games are "Free to Play" When it should say "Free to Play but controlled by coiners". I do not blame coiners, I blame plarium, if they encouraged more people to play free, and removed superfluous units and events, more people would play and join the game. More free players would also then some money, which would make more money for you.
Finally. Three servers. Why? You have pointed out that most only play on the first server, as the game is now less than half the size it was when you created those extra servers. The number of total players on all three servers is less than it was on only one server originally. It is time to merge all 3 maps.
Summary. By merging 3 maps/servers, removing low lvl dead cities, publicising the game in other avenues and generally actually listening to the people who actually play the game, there may actually be a future for this game which many love and have played for many years.