Very cool game @thepassenger! Here is my answer:
If I could change anything in my life, I think I would've wanted to realize what was most important in life earlier. I have learned a lot about what is important, and the material things in life are a waste in almost all respects. I have been fortunate to make much money over time, but when I look back it wasn't the things I "possessed" that made me happy.
It took me losing it all a few years back to figure it all out. Now I know, and I wake up every day happy to be alive and to be able to help others. I have been blessed in many ways, and this understand is amazing. If I had known it earlier, I might have been able to help more. (But I'm not complaining, because I still have quite a few years left to make a difference) ;)