Making private servers free is a mistake because their funding would have helped finance the teams and development (Example: The video game Hell Let Loose).
To retain players and encourage them to play, add new areas to the game (Example: a Glacial Zone).
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Bring back the Devil with a Fortress that can be activated with the key from the Tomb of the Banished, just like the Devil Fruit is activated with the skull. Having Garrison Fortresses nearby would make your work worthwhile.
Regularly add events that can be played during the week. There aren't only weekend players. Enthusiasts play during the week too.
There are so many other additions to make; the community is surely ready to continue playing this magnificent game. Rare Studios may not have a large staff, but you have a golden game on your hands. Re-evaluate the business model; do things to make Guilds more attractive.
In conclusion: Good luck, we're counting on you, Developers.
