Major core changes happen by accident due to circumstances and/or mental state at the time. By sticking at it only increases the possibility of making that snap decision that has that mind pattern change in your timeline.

Accidental reset that can come from a careless...had enough... dont want to comply with your inner thoughts to which you rebell against that happens to be an out of character decision that becomes the new norm from that moment of high.

Also progress isn't to be thought as big changes but in every day accomplishments.