Kingdom

After the quest Throne of Miscellania you can unlock the Managing miscellania minigame. You can make up to 1mill per day while AFK using this mini.

Have all resources put into the Maple logs, and the rest in Herbs. You will get Bird Nest. Sell the seeds, and crush the empty.

(However, if you work on training cooking, you might want to get some uncooked fish this way.)

NOTE: to make 1mill per day, you need at least 50mill in the coffers. With 1mill you only make about 100k per day.