Solved

niveau plafond pilote

Bonjour , je voudrais savoir pourquoi mon pilote ne peut plus évoluer,
c'est marqué que son lv dépasse mon niveau plafond?
comment puis-je l'augmenter ?

You driver will still level, but slowly. The only way is to stop training until you level, then you can train at a faster rate, but it won't last long as your driver will again exceed your level.

It's a good problem to have if you have trained them correctly.