Do you think you could change how things turned out with another "playthrough" of life?

If you could go back to an age of your choosing (e.g. childhood, high school, early adulthood) with the knowledge and perspective you have now, would you be able to substantially alter how things turned out? For argument's sake, suppose predicting specific future events is off the table - you don't know to invest in Bitcoin, for example, and people around you may not do exactly the same things again. But you can still pursue opportunities you missed out on and take advantage of an adult perspective of what is and isn't important in life.