helping gale really is help one (1) man overcome his splitting tendencies of all-good or all-bad and integrate a more complex, nuanced concept for himself and others.

he is neither gale the special prodigy wizard on par with a literal god nor gale the shitbag idiot doomed to make mistakes, marred by disgusting human flaws. he is in fact Just A Man, capable of good and bad like everyone else, prone to success or failure like everyone else. he does not need to be ruled by pride or shame.

his idolization (and dismissal) of mystra and the player character are extensions of his stark flip-flopping binary. it is also a tool to help bolster his own unstable self-esteem. if who he is with is good, then he is good. being in a relationship with mystra was the ultimate affirmation.

his desire for godhood is to pursue a version of himself without flaws. or, if there are flaws, he can easily fix them as a god. he thinks if he is a god he will finally be Good Enough, but the only person actively invested in seeing him as uniquely defective is himself. he uses magic as a coping mechanism, it is literally magical escapism. to flee his own (natural, human) flaws into a world where he is in complete control, where everything is (or can be made) beautiful.