The most useful habit may be the one that makes another good habit easier.

Some habits pay directly and some pay by lowering the cost of everything else. Going to bed on time is not impressive on its own, and it decides whether the morning walk, the patience with your family, and the hard hour of work are available at all. These enabling habits are easy to overlook because their benefit shows up somewhere else.

Look at the thing you keep failing to do and ask what makes it hard on the days it fails. Fix that upstream condition instead. One well-placed habit can carry three others.