Inspiration is about getting you interested to do something, so a singer could inspire me to start singing lessons or go into that career. However, 'insight' is more about gaining more information or a better idea about something. So 'gave me the insight' to transform my lifestyle doesn't make sense here because you are saying "it gave me more understanding to transform my lifestyle". You could use the word motivation or incentive would also work in this instance. Hope I helped!!

Insight is based on thought, it leads to deeper understanding (and is usually followed by "into"). Inspiration is based on feeling, it compels or motivates you to do something.