You seem to be identifying yourself with only those beings like you that exist in universes like this one. I don't think that's necessarily valid, and removing the requirement adds more interesting options.

Let's say you exist in distribution of laws of physics, not just locations in this one. Then, attempting to kill yourself could change that distribution for those of you that survive.. in particular, it could vastly increase the measure of those extremely complex worlds that care about intelligent life.

For reasons that have been thoroughly explained previously, this would not necessarily be a good thing..

Another way to put it, then: If quantum immortality holds, even for non-quantum deaths, then there's a good chance that "death" really means "having your soul eaten by cthulhu", even if cthulhu has to invent it first. Fun stuff.