Basically, when I arrive, I'm gonna use a spaceship to find Thanos and his army, and fight him. I don't plan to kill him, nor even cripple him, but leave scars and try to make him scared of me, which admittedly isn't an easy task, though I do have perks to help me play up as a very powerful very scary entity. I want to then go to somewhere isolated, like maybe Alaska or Montana, somewhere isolated, but also not isolated enough that they have no contact with the outside world. I want to establish a following, probably a cult, in this area, wherever it is. I would also use some of these cultists as spies, and use teaching perks to let them get enough experience to become good enough spies to infiltrate the governments of the world, including Wakanda. I would tell my followers, to send vague but concerning messages to the avengers an allies, basically as an attempt to build up the horror of my own power, and make them scared of me. I would also foretell of a "age where half the universe turns to ash", explaining enough, but vague enough that it explains what the happenstance is without saying when or how. I would them put myself into a coffin (or some equally extra place for me to be), and tell them to wake me up when the age comes. Come Infinity War, Thanos snaps his fingers, killing half the universe. Then, whether mundanely or supernaturally, the surviving heroes are brought to my holding place, and due to my build up of horror and the like surrounding Jumper, they are scared and concerned about what I'll do. Then, in some extra ritual, the coffin (or whatever) bursts open, showing me awake and wearing really edgy and goth clothing, fitting an undead necromancer. I would also like Thanos to somehow be notified of my awakening, which if my plan works means that he would be terrified of me awakening. Then, after all this buildup, I plan to help the avengers and allies defeat Thanos for good, and restore the universe.