I hurt my back at work on 03, I was a licensed commercial/industrial electrician. Surgery fucked me up even worse. I lost my career, it took years to come to terms with and I still struggle.
I've embraced my simple life, I work part time and am on disability. I also am a full time single Father which is another thing that changed me.
I've learned that we should never let our careers define us and that life is fragile.
Also my mom died three years ago, something clicked in me after that.
So many life experiences that caused huge growth for me. I really can't narrow it down to one...i think the decision to accept atheism and leave religion could be the one that made me start to do things with my life knowing there was nothing else. Understanding that time waits for no man. We all get old and there is a song lyric that states "time is like an hourglass glued to the table". There is no turning it over to get more time. Do with your life what you want. Don't wait. You are the youngest today you'll ever be!
realising that people on the whole are not very intelligent /or not as intelligent as I assume them to be - realising that has made me a whole lot more laissez-faire about how i treat people and also very careful about forming friendships. There are some people in my housing complex who are really off teh wall and a lot of the males are seriously out to prove how great they are by taking over - I npw stay in my own flat most of the time and just take a stroll to the sea and love my own company - it helps.