Feng Shui 2 How do I increase my main attack?

This question is less for me and more for my players. Do they use "Increase a skill value of 12+ by 1" or is it mostly reliant on schticks to increase? Thank you for your time.

Increase skill value 12+ by 1 to raise the main attack but you cant raise a stat if its already the highest in the game per your fortune stat type, i.e." Sam has the highest martial arts AV between the 2 players with chi so he can no longer raise his martial arts until the other player ties his martial arts AV also Sara in the same game is the only player with the standard fortune stat type so she has no limit to what she can raise her stats."