KB is definitely the ticket, especially stage 1, but I’d say the other stages are not devoid of assistance either.
I will mention it’s not a magic bullet, even though it’s probably one of the best subs for it (and this is the month for investigating that solution, lol). If you are a very intellectual, inquisitive or explorative person, beating PMO may be more challenging than for “average” people.
What you are likely to find, and I base this off my own experience, is that there are several different paths the sexual energy can travel down, and as a result a couple of different projections for how long it will take to beat the habit.
I would probably suggest (New) Regeneration with KB might be more efficient, because I have noticed Regeneration helps to stop you from repressing desires within the subconscious with too much force. That way, it allows the problem to be more in your face so you can confront it and examine it for what it really is. Repressing it through sheer force of will without close examination is a more difficult and less foolproof path than not repressing yet witnessing.
The reason I mention intellectual or inquisitive nature is that beating PMO, especially if it is a well established habit, means shutting or redirecting all the gates to giving yourself permission to go down that road. Once you have shut down the purely pleasure based pathways, you need to deal with the demonic and/or spiritual, which often appears on the surface to be purely mental at first.
Since astral parasites feed off the lower natures, including lust, they will often present one with “thoughts” such as the need to “test” your ability to resist the messaging present in pr0n, or other novel ideas that give you “permission” to experiment. Such as “I really need to understand at a deep level what motivates this desire for PMO, so why don’t I just do it and then watch very closely what happens in my mind and body…”. In other words, you will come up with any seemingly logical excuse other than purely pleasure based motivations to go down that same pathway. This is usually at the same time as the sexual energy surges again, or is high enough to have a strong impact on decision making.
So when I say explorative, inquisitive, intellectual etc will have a harder time, it’s mainly because there is a greater range of circumstances that will lead to you considering the idea of PMO, and a greater tendency towards self-justifying your own actions.
When I originally started with KB, it did take me several cycles to get the tendency towards PMO down. I also found at the time that RoM helped me, but it may or may not help you. It’s more likely to if you are a very intellectual person (which a lot of people with a tendency towards PMO are). You may need to let go of the need to remove the problem in a short period of time, because any habit which is as heavily entrenched as PMO (which is heavily linked to the subconscious) is going to require the same kind of level of force applied in the other direction, and this naturally means that adjusting your own relationship with this sexual aspect of your being may take longer than you expect, and it is best to maintain patience with your own failures in order to establish the new behavior.