A sum from 7 to 9 is the reverse of the first band: the mental field is already full, and there is no room in it for anything new. What one should lean on is what a person has been able to do for a long time and what came to them without any training.
By this logic, mastering a profession from scratch in adulthood will be hard going, and earning from it will not work out even if the diploma is obtained. The stake is on deepening what is already there: not changing field, but going far enough within your own to reach the level where mastery begins.
None of this cancels curiosity — again, this is only about what to earn a living from. Learning something new for yourself is not forbidden by the system and is not counted as a mistake.