1.) make ferkens permanent
-all returning/invited players dont have that much time to level or at least we need to party with them just to enjoy the game. if you havent realized yet people dont buy preservation stones for below 100 gears.
2.) increase blueprint drop/gathering materials obtained
-maybe 3-5 pcs per gemstone/mineral/plant is not that bad for FASTER crafting of materials
3.) create events that make players want to kill for.
-try to create more events to reach more if not ALL people. you have thousands of people playing and you do events for quite a few, try to upgrade your lame events like finding gm/riddle/spot the difference.

it's 2021, maybe you may want to adapt new concepts, most mobile games tend to offer new servers every week which is meaningless since they tend to merge them every month. So instead of making more why not make new players catch up and enjoy the game.

and yes people lure friends into playing into private servers because they actually offer better gameplay, you should be reviewing them and offer something better if not lucrative.