You are a high-level spacetime and dimension manipulator. To you, the past is clay to be molded and shaped, and the future is no more able to resist your will, you are able to enter all possible pasts and futures.
With this power, you can warp spacetime in order to traverse to any location in an instant, or alter your progression through time. You can affect not only yourself but objects and living organisms as well, by chancing their spatio-temporal properties and send them careening them into the future or past or compress them down to the volume of a penny. You can decrease or increase the distance between any two points without moving them, create fields in which time moves thousands of times slower or faster, and whisk objects between dimensions as you please.
You may, potentially, cut holes in dimensions so vast as to warp the laws of one in accordance with the other, or create your own empty pocket-dimensions for yourself, which you may occupy with objects you take from local realities and other futures. You can even interlink dimensions via your own dimensions to create a nexus of possible futures and faraway spaces if you are so inclined. Nearly any manipulation of space and time on a finite scale is within your grasp, and the maximum finite scale with which you may operate will increase as your powers develop. Note that as time itself slows, so too will the development of your abilities, meaning that their growth is dependent upon true time and not dilated time resulting from these abilities.