"Maiquel
Thank you!
As I won't have a better car, will you suggest me to make efforts in next season or in present season developement?
As Nag said you will get
next season developments if you change after the last race of the season except when all the cars in the league you are jumping to are below your development. I had level 7 and 8 managers with highly developed cars jump to my rookie league with only level 4 managers and keep their car development and then all the other managers cloned their parts. They did not dominate the races.