After quite some time (and a couple breaks), I notice the level required for new cars comes seem quite slow : I see I started ~4 months ago, have 10 platinums, 24 golds and 1 world best (didn't do much on no-drift), and I'm lvl34... Still a very long way to that lvl95 car haha
Although at the end, it completely doesn't matter since every skin has the same performances and it's even fun to see that I could still unlock stuff after months of playing