I really don't know what the strategy is. I've been restarting the game so I can do some trial-and-error to find out what works, but some in-game guidance would be appreciated.
It's a bit too slow-paced for me. Most of these jame games I'm playing during short breaks from work. This one I'm letting run in the background, but even when I come back to it, I find the cash is coming in too slow so I still have nothing to do.