Although I post this in the bonfire, I'm quite interested in this in seriousness as well.
Mine would probably be a bit more boring. If I hadn't found something of similar or more interest to spend some time on. That is to say, 'knowledge' about MBTI or typology have never been of much influence in my environment.
But I can imagine it may have been a big change for some people, having a different perspective on life changing descisions, such as relationships, job oppertunities, etc? And I'd love to hear the what and why behind it!