change (one's) ways

To start behaving in a different, usually preferable, way. After I got in yet another fight at school, the headmaster told me that I had to change my ways or else I'd be expelled. No matter how old you are, there is still time to change your ways. Well, that negative performance review sure seems to have changed Susie's ways. She's been the ideal employee ever since!

change your ˈways

start to live or behave in a different way from before: I’ve learned my lesson and I’m going to try to change my ways. ♢ It’s unlikely your boss will change his ways.