Linear Space-Time is an invention of humans. The past is a convenience invented by us to describe memories of "the past" that exist in the present. Linear Space-Time of past, present, and future are illusions.

Time travel is possible - via consciousness. There are also arcane principles that exist outside Linear Space-Time that makes Time Travel possible using massive amounts of Electromagnetic energy. I prefer two other modes of time "travel" that has been used for millennia. One I've already mentioned. The other is inclusion.

Oh, and BWT free will does not exist for most people, even for me. Free Will is an illusion within the dense vibration of divisveness we collectively find ourselves within now. And that is another story for another time (pun intended).