Slow change sticks like paint that dried properly. Rushed change peels.

Fast change runs on intensity, and intensity is the first thing to fade. A slower version gets built inside the conditions it will actually have to survive: tired days, busy weeks, stretches where you do not care much. That is why it holds. Nothing is skipped and nothing is forced to set before it is ready.

Cut whatever you are attempting in half and stretch the timeline out. Choose a version of the change you could still manage on an ordinary bad day. Let the pace be unimpressive and let the result stay.