I don’t know why, once conceptually it were possible
It would depend on how you choose to do it. Here’s one hypothetical whereby you would be limited.
Imagine a model as follows:
You create a stable wormhole in the year 2016.
You keep one end of it (side A) here on earth and fly the other end (side B) on a ship a near c speed, which then time dilates into the future.
You could, in theory, travel from the future (side B) to the present (side A), but you could only go to a time when the wormhole existed. Since it did not exist before 2016, you cannot use it to travel further back in the past than that point.
The Wolf