I have almost 999 AP and I was thinking on putting it on Gladio or Prompto limit break or the Limitless Link skill.

However, there are still some AP skills that I havent unlocked(like half of the Arimger tree, half of the Magic tree, some of Techniques tree, half of Noctis's abilities, EXP stats skills and Wait Mode tree)

So I am undecided to go finish all the 333 AP skills and below first before going after the 999 AP skills. If I go for the 999 AP skill, I dont have to worry about the long journey to complete the low AP amount skills.

EDIT: I am using Windows Edition and I am well aware of the cheat engine for the Windows Edition to get the AP but I am afraid of corrupting my save file.