Under the 12 step model, resentments fuel relapses. Steps 4 and 10 are about removing or at least processing those resentments, which increase your faith in a higher power. Maybe you don't have a lot of amends (steps 8 and 9) to make over fapping, but maybe you owe amends to yourself for wasted time and potential. Once you start praying and meditating (step 11) you may find yourself in a position to start helping others nofap (step 12).
Perhaps you are not entirely powerless to avoid fapping, but if you find yourself relapsing often, you can probably admit powerlessness over the urge to keep going once you cave in the first time, and some degree of powerless over the stimuli that you encounter. If you have any faith in a power greater than yourself, you can increase your connection to that higher power by turning your will over to it (which can be as simple as the spirituality of two people helping each other resist the urge to fap).
I know many people don't like the 12 steps because of the word "God" but in the 12 steps any conception of God will do and it seems like there are at least some believers in here. Sex Addicts Anonymous is a 12 step fellowship for compulsive fappers and other sex addicts.
