> You break the lightcone...

The point is you can't. Existence would be a static 4D structure. No matter how you tried to change the past, your attempts are already part of your own history and clearly all failed.

> Let me save people the time, there's critiques at the bottom but there is no actual evidence for retrocausal explanations: https://plato.stanford.edu/entries/qm-retrocausality

There is no evidence for any interpretation of QM. That's what makes them interpretations and not distinct theories.