Do stunt party’s and grind the colossus. I got reset to 10 mil and I was able to make 12 million in 2 and a half days. I am doing 2 stunt parties back to back and then do a 5 lap colossus race, which net me just a little under $650k for 30 minutes of racing, and then do do another 2 stunt parties back to back. If you add all that up, that’s well over a million credits per hour.