With respect to the OP,
This really is an issue of addiction. A person becomes addicted to their own biologically generated pleasure chemicals. Their brain is swimming in the stuff, and when levels begin to drop too low, one doesn't feel normal anymore, and the urge for another fix begins to grow again.
The problem is twofold, one, there's no escaping one's own body (while alive), and two the most problematic sex organ isn't the genitalia, but rather the brain.
So unless one has a iron will, or a handy miracle, one may have to supplement ones spiritual exercises with pragmatic ones.
1. Stop trying to win the "war" in one fell swoop. Accept that it may take a concerted effort over weeks if not months to end this problem. Also accept that it can be won even if progress day to day must be measured in inches not in miles.
2. Porn is a heart and brain problem. It is the easiest to stop since basically it feeds the sexual imagination. It is a heart problem because it objectifies the person being watched, makes a kind of sex toy of them. It adds to their sin and to your own. It is best to cut porn off cold turkey….it's actively hurting others as well as yourself. But people can slip. One way to break a slip is to take a moment to humanize the person. Look in their eyes…are they happy, sad, bored, putting on a show, cold, calculating…and in that moment pray for them (Lord have mercy on Thy servant, or something of that nature.). A couple of prayers like that takes the steam out of the porn session enough to turn it off. But turning off the computer doesn't turn off your brain. There are lots of images still in your head feeding any sexual ideations you might have. There's not a lot you can do about that, except to stop adding to them…and refusing them when your body/brain is screaming for a sex fix. It wants the chemicals…so give it the chemicals…but give them quick and don't indulge any sexual fantasies. Do what you "have" to do to feel normal, as quickly as possible, but cut off all sexual ideation from the act. It's still a sin. Still something to confess and repent of…but at least it is not entangling others actively with that sin. It's a way of having mercy on those who put themselves in positions to be fantasized about.
3. After a week or two or three of ending sexual fantasizing while engaging in sexual stimulation, that will feel normal. From this point on, getting free of this addiction involves getting your brain and body to feel normal on less and less chemical stimulation until your body's own natural "cleansing" functions take over…a cycle which for most men is every four to six weeks, for young men it may be more frequent….but that's not the point. So one begins by a careful pattern of stepped reductions over the course of several weeks. If one has to do it several times a day, then work it down to once a day. Then start whitling it down through out the week, so that there are "fast" days, first the Lord's Day, then one more, then one more, divided up throughout the week as is most helpful (day on, day off, day on, two days off, etc.) But the idea is to make each stage of stepping down last at least two or three weeks…till that pattern, that level of "stimulation" feels normal. Then step it down once more. If you slip and can't get back on track, then go back to the level you last had success and repeat it and try again. Eventually once a week will be enough, then once every two weeks, then once a month…and somewhere between once a month and once every two months, natural processes will likely make the issue moot.
It will take prayer and vigilance to stay away from old habits, but the chemical dependency will be broken. Then the issue will likely be the types of dreams that accompany natural release." These will diminish in time, and prayers to the Theotokos, committing the watch care of one's sleep to her really does help in that regard.
So…is this the best way? I don't know. It is still a sin, but as a habit, an addiction its a path of improvement, so there is that. Does it work equally well for all men of all ages? I don't know. For some it may take longer steps to get effect, others may succeed with less. If will is too week an accountability partner might help. But the essential principle, of treating this like an addiction to a drug and taking graduated steps back to a normal body chemistry equilibrium…weening from the drug, is sound when preceded by a determined laying aside both of pornography and engaging in sexual fantasy...The sex organ most in need of taming being the brain. You might want to discuss the use of such an approach with your priest, perhaps in concert with some spiritual discipline that helps build virtue and spiritual support from other side. What I do know is that this way does work for some who have tried it, and it takes about 9 months to a year to get consistently clear and maybe another year or two to get past an occasional slip. But once done…abstinence has become the habit not regular sexual stimulation.