I'd go back to the moment I decide to go back, then kill myself and instantly jump to the moment where my other myself decide to kill myself and save myself from myself. Then throw myself into the time machine and send him to the time I save myself from myself so he can prevent me from saving myself, but right after I throw him I would jump after and save myself trying to prevent myself from killing myself from being killed by myself. Then jump to the moment I decide to jump and tell myself to don't go. Space-time should go nuts by now and I'd do a troll dance on Einstein's grave for the lulz