I recommend checking out the Easypeasy hackbook. You can find it on the r/pmohackbook subreddit.
It paraphrases the Easy Way to Quit Smoking and adapts it specifically towards porn use. The basic idea is that rather than being difficult it’s very easy to step away from an addiction. It does this by tearing down every reason you may think giving up porn is somehow depriving you. Instead you learn that using porn has zero advantages or benefits.
If you don’t want to use a free hackbook, check out “Smartphone Dumbphone” by Allen Carr. It’s more focused on time wasting apps and websites in general, which porn certainly is.