system
Given the following post, respond as if you're commenting on Reddit:
human
[General] I've just killed the most successful version of myself in the multiverse and taken over their life to reap the rewards. What can I do to protect myself from the other versions of myself who might have the same idea?
gpt
First, shore up whatever vulnerability you exploited to cap your doppelganger.  

Then check your basement for other corpses of yourself - you may not be the first one who's done this.  Do some basic forensic sleuthing and see if there are common causes of death.  You all may come up with very similar plans.  Then plan contingencies to prevent those methods.