Use the loss forums for selling losses:
Torn Forums

Selling losses has limits because your energy and med cooldown are limited.

Flying is one of the best money makers if you can stay active and keep flying often.

Camel plushies are one of the safest and fastest items to sell.

Some other items give better profit, but they may take longer to sell.

Buying low and selling high on the market can still make good money.

Join an adult novelty company for eDVDs:

Sell them for profit, or

Use them for happy jumps.

Think outside the box:

Graphics design

Discord bots

Other player services

Keep most of your money in the bank for 1–2 weeks to earn extra profit.

Make it a challenge:

Track how much you make each week

Try to beat your previous profit every round.