1) Unlock all chairs in your tavern
2) Max out the upgrade that increases the bonus silver you get when collecting your tavern's silver
3) Max out the upgrade that increases the bonus silver you can get when visiting another player's tavern - 30 silver may not be much on its own, but it adds up
4) Most important of all, add more active players to your friends list. You can have a total of 140 players in your friends list - make ssure that the majority are active and visit your tavern daily.