How do I increase a player's growth value?

A player’s value is determined by two main factors: their current quality and their potential. To maximize a player's worth, you need to focus on consistent development and strategic boosts.

1. Daily Training 
Players possess an innate potential that develops through consistent work.

Players should participate in Daily Training every day until they reach age 30.

If you do well in daily training sessions can provide a slight "extra" boost to their growth.

2. Training Camps & Personal Training
If you want to significantly increase a player's price tag, you must go beyond the basics:

Each Training Camp and Personal Training session permanently raises a player’s lifetime potential.

3. Understanding Age
Timing is everything when buying or selling:

17-year-olds typically have low market value as they are unproven.
You will see the most significant spikes in value between the ages of 21 and 23.