Quit porn by changing the environment, having a plan for urges, and tracking clean days. White-knuckling alone is what most people already tried.
“How to quit porn” is one of the most searched lines in this space. The plan that actually holds is boring and specific: remove saved files, log out of throwaway accounts, put a filter on the browser, and decide tonight what you will do at 11pm instead of scrolling.
Then you need a response for the urge, not a speech. Delay ten minutes. Move your body. Text someone if you have that person. Mark a clean day when you make it through. The first week is mostly about surviving evenings.
You do not need a perfect identity
You do not have to call yourself addicted or join a 90-day challenge for this to count. You need a next action when the cue shows up. If mental health is in the mix, talk to a clinician. An app is a habit tool, not therapy.