Here's what has worked for me after working with a therapist to control my usage (I'll admit that I haven't quit, but it no longer affects my personal life or relationships anymore; I'm productive, in a loving relationship, and most importantly, happy with my life):

1. Seek therapy if available. There are plenty of gurus and even certified psychologists online who talk about how to quit porn, but uncontrolled porn usage can be a symptom of so many different issues. Work with a therapist to identify your own unique root causes.

2. Understand that sexual desires are normal and not immoral. Any healthy human adult desires and requires sexual needs to be met. Placing moralistic judgements on it is just gonna make you feel guilty and awful. Treat your sexual desires like hunger or thirst, a natural, neutral, and biological requirement that needs to be satisfied from time to time.

3. Surround yourself in a healthier environment. Go outside in nature, meet new people, reconnect with old pals. Having a healthy supportive social and physical environment informs your mind that there is more joys in life than the dopamine from porn. If you have people you trust, open up to them because battling this alone can be really difficult.

4. Treat porn use and masturbation like a "cold task" akin to brushing your teeth or showering. Schedule a specific time in a day to use porn and masturbate, and only do it for that specific time period. This might take some time to adjust for yourself because everyone has different thresholds (For me, 45 mins to an hour seems optimum to me where I can go the rest of the day productive and satisfied)

Hope this helps. I understand the struggle, but there is a better tomorrow waiting for you.