I just finished my careermode officially.
I already was at level 50 and now I got all gold for every challenge series and are now at 100%
Now I only have to have are some of the cars achievements and the 1.000.000 credits in online races, and I am only at 200K.
I am now starting to race old races with other cars (alreadys started that a while ago) and start with some stock cars with the first races but then in Hard mode and not with a big advantage to the competition so stock D class cars... pretty challenging, specially when you only get 1000 credits for it.
I now only have to get the all racecars, all US cars and all cars achievement, and then I can sell and gift alot of cars I don't like, or don't use