you now should prefer to self modify to be the kind of person who does care about Everett branches descended from this one in which you no longer exist, since that gives better expected results (from your current perspective).

Makes sense, thanks for articulating it. This is the reason I don't consider quantum suicide (via cryonics) a reasonable position until a normal end of life situation.

And without using cryonics, quantum suicide has the potential to be a very bad experience. Cryonics is a rather all-or-nothing approach, which is good in that it reduces the very large middle ground where I survive but with 40% brain function. (As noted in Valdimir_Nesov's link)