Mentoring isn't guaranteed success. When the player is unambitious, this isn't something that can necessarily be overcome.
There are times when mentoring and the environment can help a player improve, but not everyone does. There are sometimes talented players who just don't want it enough.
Mentoring is a slow and incremental process, so you are not going to see massive gains. You might be able to nudge an unambitious player to a more neutral personality, but it's unlikely you'll get him to anything higher.
If you control the Under 19s or Under 18s training, you can set up mentoring programs. Most will look like the above pic where everyone has a light influence on the mentoring due to age and experience.
Alternatively, you can add those players to the training unit in the first team, and then on the mentoring page ask your assistant to assign mentoring groups and he will add those players.
That way they will be in the U23/U18s for match day, but train with the first team and receive mentoring. You can't do it manually though for some reason.
Mentoring used to be exploitative, but since FM23 Sports Interactive randomised it more. Now whenever you come across a bad personality - regardless of potential - it's probably best to discard him if you're already a top side.
In Youth Academy Challenges where you rarely have a choice of discarding early in your save, you are forced to keep them around till your squad improves.
Try to mentor them and hope to see incremental improvements or you let them go. Unambitious personality is possibly the worst attribute for a player.
Credits: santy001, Dotsworthy, nms1987, bulletsponge01, Rashidi
Source: footballmanager.com
