You are going to die in one year. A magical pixie has told you so, and there is no getting out of it. However, the magical pixie has also granted you a SINGLE wish with a caveat: This wish must be use totally selfishly. IT can not be used to directly help or benefit anyone but you.
@Surasanji Supposing that one year meant one-year proper time for my frame of reference, I want to be able to adjust my speed to any speed either below or beyond the speed of light.