"because after a couple of years now, finally my mind is starting to not go to porno by default,"

You've de-hedonically adjusted your brain so that more "normal" sexual experiences are once again exotic.

Think of it like if you had chocolate cake every night for years, it would lose it's ability to trigger the pleasure center of your brain as effectively, just like gaining resistance to a chemical with regular use. What you did is grounded your brain from (sexual) stimuli it hadn't earned, and like a child you un-spoiled, it regained discipline and you regained control.