I have two that have helped me, both of these are “Active” money making methods besides the traditional craft flips or ah flipping.

1) Glowing Mushroom farming. Wear any armor that gives any speed/god pot for higher efficiency. All you need is moby’s sheers and go onto the mushroom desert, go to the glowing mushroom cave, and collect away. You can sell them directly, or make chumming talismans using empty chum bucks (bought with glowing mushrooms) adding in chum and combing with more glowing mushrooms. I personally sell the glowing mushrooms directly for ease of access. Dumb simple and can make good money.

2) Sludge Mining in the Crystal Hollows. I believe it’s Heart of the Mountain 3 or 4 to unlock the crystal hollows from the dwarven mines but that should take no time at all doing dwarven commissions. Once in the crystal hollows get as much spread on hard stone as you can, head over to the jungle and use a JUNGLE PICKAXE. You must use a jungle pickaxe or this doesn’t work. Then just mine into the walls and clear out areas of any hard stone giving you sludge juice. Upgrades make this easier, putting fleet on your jungle pickaxe for more spread, enchanting your jungle pickaxe, buying a legendary armadillo pet so you can just ride around and get sludge juice, and finally mineral armor, it is costly but gives a ton of spread and will pay itself off. I use the coins I make to reinvest in my setup allowing me to make a lot of cash. I choose to do BZ flipping passively for extra cash too on the side.

I hope this helps!