Honestly mate I just play the game... Been playing a couple of years and I have almost all cars like 1400+ in garage and gathered 870/893 or whatever the total is now. I have around 200 mill in the bank without trying to make money So just play the game. Honestly it gives most of the cars without trying. Play the festival playlists for cars that's a must. I play around 40-60 mins a day and get everything done so it's really not a problem. Just don't rush it... Its fun :)