it doesn't grow when I train new role

[Kwal]

It doesn't matter the quality with the fact that I want to give him another role

It does matter. Guido van den Berg explains it well.
In order to train this new role more quick you will have to train a drill with a low average. You can use a training tool to see which drill has a low skill average.
My training tool you can find here, but there are more of em on the forum.
Without seeing your player's skills it will most likely be the best to train something like Press the Play or Stop the Attacker.

Note: I believe that you shouldn't combine a AMR/MR with DR, as there's too much difference in white skills. DR will add another 4 white skills to your player.