Hunting and Fishing - Hunting (and especially fishing) is still much more profitable in Red Dead Online, because it seems that despite the generally lower income available in Online mode, you earn about the same amount for your pelts and fish as you would in single-player. These are sold at Butchers (marked on your map already) rather than the Trappers found in single-player mode. We explain How to get perfect pelts in Red Dead Redemption 2 in our Hunting guide! Salmon-fishing seems to be most profitable if that's your preferred method.
Sell blood or donate plasma. Plasma is a component of blood, and the process of extracting it is similar to donating blood: your blood is drawn, the plasma is separated, and the red blood cells are returned to your body. Laws may not technically permit you to sell your plasma, but you can be compensated for your time spent donating. In the United States, you can make about $200 a month by registering with a plasma center near you.[10][11]

 If you’ve got some free time and don’t live in the middle of nowhere, becoming a Lyft driver can be a very lucrative side hustle that allows you make money fast. And right now, they’ve got a promotion going on where any new driver will instantly get a $300 bonus after completing their 100th ride. If you start now and hustle hard on the weekends, you can probably unlock that bonus within a few weeks of driving (and that’s in addition to your normal earnings).