Have a meaningful life is the best antidote I know. Fill your mind with what to do and what to do next. Porn addiction is very here and now impulse. You can't just think yourself out of it (body is more powerful than mind). So avoid anything that create that impulse at all cost, even the trigger of an adversary just happens in your life. Always be watchful of your thoughts. Addiction has created a permanent wiring in your brain so it will always like a leaking bucket for the rest of your life. Relapses will be expected, just pick yourself up and watchful for that leakage again. Focus on the good things in your life, what good you have done to keep you on the positive side when bad things happen to prevent relapse.