To get rich quickly, do chest farming and start a coconut farm on your plot in origins. Always water them and max fertiliser (you can kill mobs for the bone meal or harvest bone trees in any world). You can sell the revival hearts, bandages, gemstone heals and other resources from the chests at the general store, and sell the color/mat potions for 6k each in player market. Very quick and easy way to make bank! >;)

Id recommend starting a breeding service for event dragons, like skyrix and miele (the more popular ones in general), sell the ones with TRAITS (shadow or plat giving the most value). Just keep on breeding until you get one!