Regularly, thoughtfully, diligently, asking questions like, "is it worth it?", when considering dietary indulgences, and then following up with, "how much of it do I need to be happily satisfied?", rather than militantly, blindly, saying "No", and you'll have a far better chance of longterm thoughtful reduction.
All or nothing lifestyle changes might start off with a well-intentioned "all", but almost invariably lead people back to an all-encompassing, "nothing".