Very good question. I've thought about very often. However, I was always clear, a change would set in motion another chain of events. Maybe I would not like this. What then? Would I go back again?
I could waste my life, is to change the past. But it would really change my life? Would it improve my life?
But of course, with the knowledge of today, one could also intervene in such a way that one buy stocks, land or business Shares.
A beautiful mind game, anyway.
Ultimately, it would be like in the trilogy "Back to the Future ". A great film.