I don’t think so. I am of the opinion that only these 2 options are possible: 1. Anything you do in the past to “alter” the timeline was already part of the timeline before you made the jump back in time. In otherwords, self fulfilling destiny. 2. Anything you do in the past to “alter” the timeline will result in a split of the current timeline into two distinct versions, one where the alteration occured, and one where it didn’t, the latter being your home timeline.