Even if one travels to the past using a time machine, the past will face a different future every time. This is because the countless entangled variables of randomness cannot always lead to the same result.
For instance, the thoughts and actions of a person who stands at the crossroads of tens of thousands of choices every hour, or the random calling of programming languages and quantum mechanical natural phenomena, if reproduced by turning back time, would never show the same pattern. Time is also a natural phenomenon that can be perceived by light and space, not a videotape that can be rewound and played back at will.
Therefore, fate or prophecy is just one of the many possible futures that could occur. The most important thing is the choice that one’s current self makes.