Complete the Space Oddity Side Mission (see image for location) and get the item: Untitled 18, Brancesi 2021. This painting sells for 4k eddies. Use the duplicate item exploit (see link below) and sell it 5x for 20k eddies. Skip time 24 hours and repeat for infinite money. This glitch works in v1.1 and below. Revert to an older version, get money and run an update after.