No one is clever enough to figure out a way to change the past. I’ve lived a pretty unapologetic existence but there are a few things I’d go back and change if I were given the opportunity. Fortunately, that is not how reality works. We are allotted the opportunity to learn from the past, wallow in it or even ignore it entirely. But the best stories always end in one of two ways, by either succumbing to a tragedy or overcoming it. Either of those seem infinitely better than experiencing a mundane and dry existence absent of movement or poetry.
There is no assurance that people, luck or fate (if you believe in such things) will always be on your side. My advice is for you to just try to stack the deck in your favor. I can’t say with any certainty if the world is better or worse for my having existed in it, but I’d certainly like to attempt to make it a little more interesting.