In terms of money most people buy stocks high (when there’s lots of hype) and sell low (when everything comes crashing down). The ones who are successful do the opposite.
With self-development it is very similar: we tend to get really interested in it when life is hard and we are already in a difficult state (hype). Then we stop doing the behaviours which would have helped us to grow when it gets hard to maintain.
It’s not about becoming a habit machine and never missing a day. It’s about adopting the long-term mindset of a successful investor: often the results we want take a few months or years. Understanding that the lows are normal and to be expected but also training ourselves to have faith, even if the positive feedback is not yet coming our way, means that we can cultivate the patience needed to succeed.