Keep going. Your urges at 140 days or so I think are perfectly norma. Pretty sure they are a product of your brain desperately trying to get you to plough one of the neural pathways you probably used to plough frequently. This may be pointing out the bleeding obvious but if you’re porn free but still masturbate, that pathway will still be partly in place. You should do what is right for you, but be aware of your brain’s attacks and where they come from.