Moving my private server - how can I keep my player's levels, buildings, etc?

I am attempting to move from one server host to another. I have the new server working fine with all the mods I want and I’ve tried moving the game.db file to the new server so my players don’t have to start over again and I don’t have to rebuild the admin buildings but it did not work.

Has anyone ever done something like this? What worked, if anything?