You rejecting superdeterminism, deciding that your fate is up to you, and making positive decisions to improve your life, is great. Do that.
It may be though, that those positive decisions and deciding your fate is up to you, etc, was already printed on the film. Or if instead you just throw your feet up on the recliner and decide to do nothing, then that would have already been printed on the film as well.
If in a trillion years the universe ends and there’s a complete story to tell about everything that happened, and some external observer were to watch that story, they’d see you making whatever decision you made and your life turning out in a particular way. But they wouldn’t expect that if they rewound the film that things would somehow turn out differently.
Actually it does.
Your movie is going to play out the way it plays out, regardless of whatever you do. Throw your feet up in the recliner or struggle for that next promotion, doesn't matter. Brain cancer.
I just find this rubbish.