Y don't u let players unlock special races once they complete previous day race?

I already completed day 01 races but day 02 is locked. Why don't you let the players unlock the chapters once they complete the previous chapter? 

Why does the game has to decide when to unlock? I personally don't play after day 4 as l know l cannot reach day 6 to get the next reward.

Second option is,give more number of days to reach the goal and unlock the car.

Races should be hard but not unattainable. If you keep them unattainable,players will stop playing but if you keep them achievable,then players will try to play more. Think about it !🧐