Yeah, but we're only traveling to the future, right? I wish that we could go back to the past. Is it even possible to do so?
Experiencing time "backwards" (in relation to the way we normally do) would require your entire software (consciousness) to be updated. Your mind in its current state is only able to make sense of reality by projecting the qualia of time perception that you are experiencing right now.
Even if all you wanted is to go "back" in time and experience it "forwards" (as you normally do), maintaining such instruments of travel would require countless stars' worth of energy to even go back an attosecond in time.
Yeah, but we're only traveling to the future, right? I wish that we could go back to the past. Is it even possible to do so? Can time even move backwards?
I believe I haven't answered your question in a clear manner. Time isn't really moving anywhere; our qualia merely projects us the experience that we, and other things, are moving in it. The question is not how to move time, but how to move things (including yourself) in it.
Time is merely a property of the metafractal perceived by conscious beings, expanding at a rate approaching zero on one end (singularity before the big bang), and infinity on another end (dead universe after its heat death) (none of which can ever happen), while time is also entangled with all other dimensions, the number of which also approaches zero and infinity and so on.
We seem to have the conviction that we are moving from the end approaching zero (big bang), to the end approaching infinity (heat death), while we perceive time as if it is entangled with dimensions of space things are moving in.
You could also hypothetically add more time, or subtract from time, by converting energy to / from a source of other dimensions, but in reality, time inevitably keeps expanding, approaching zero and infinity while also being entangled with other dimensions. It is just like any other dimension really.