The shortcut answer is moderation, but moderation is the wrong word — it sounds like deprivation. The better frame is sovereignty. A 14/5 in good shape is not the person who has given up everything; it is the person who has decided, on their own terms, when they want to indulge and when they do not, and can hold the line either way without it becoming an event.
Useful practices, in roughly the order most people find them helpful. First: notice the loop. Most 14/5s have one substance or behaviour that is doing most of the damage. Name it. Watch it for a fortnight without trying to change it. The watching is itself the discipline.
Second: build one daily practice that is yours regardless of mood. Forty minutes of walking. An hour of reading. A morning routine. The 5 is delighted by variety, which is why it never builds the daily thing. Force one through. The day it stops feeling like force is the day the karmic debt has loosened.
Third: be patient with the relapses. The 14/5 does not become a 22/4 overnight. Plenty of fives who have done the work still drift; the difference is that the drift is now visible to them, and the trip back is shorter. That is what self-mastery looks like in practice — not the absence of pull, but the speed of return.