If infinity truly does exist, then it stands to reason that so do all possible realities simultaneously
Not merely "multiple" realities but INFINITE realities
Therefore time is an illusion; there is nothing that has not been done, nothing you can add to yourself nor take away, you are already complete and have already lived all your lives and have become infinite yourself
Thus from an overview perspective…when you change your reality, your current destiny, or you even go back in time and kill your own grandfather, you are really literally removing yourself from your current reality and depositing yourself into the corresponding appropriate "already existing" reality by the very choices you make
Otherwise, infinity does not exist, creation is therefore possible, and what we do here really makes a difference - from an overview perspective that is; one of infinite perspectives