The past does not exist.
What is time travel? Stra Trek used it a number of times.
In the original movie version of HG Wells' The Time Machine you set a date and you go back or forward in the same place. Go forward in time, move the machine, go back in time and you are in a different spot.
There are conceptual problems. Wren you are standing on the Earth it is rotating, it is circling the sun, and circling the galaxy. Space-time.
If you are standing on the Earth and travel back in time you end up in space somewhere. If you travel forward you have to know in some coordinate system where you will be in the future.
The universe does not know time, it is in constant change. To me 'time travel' makes no sense. Matter changes positions, there is no past or future to travel to. For the scifi versions of time travel every moment of the past would have to persist forever. To travel forward in time would imply predetermination.
you’d still have the problem of not being able to use any of your senses
Relativity tells us that observers in different reference frames disagree on both the timing and sequence of events. So there cannot be a universal "present"; And therefore the past, or the future, or more likely both, must exist.
In Cartesian rectangular coordinates there are 4 dimensions. (x,y.z.t). X, y, and z are in meters and t is in seconds. The word dimension mostly from scifi has subjective meaning.
We traverse distance in meters and the rate of change in distance is measured in seconds. It is as simple as that. You can say we move through space, but we do not move through time. Time is a measure of velocity through space. We move through space not through meters, we move through space measured by meters.
If time is somehow a reality unto itself, it needs another word and definition.
Relativity tells us that the rate at which an object moves through time is dependent on its velocity; Objects moving at c (eg photons) do not move through time at all as observed in their reference frame.