You're looking at it all wrong, "you" are not "in" any simulation or universe. There exists instantiations of the algorithm, including the fact that it remembers winning the lottery, which is you in various universes and simulations and boltzman brains and other things, with certainty (for our purposes), and what you need to do depends on what you want ALL instances to do. It doesn't matter how many simulations of you are run, or what measure they have, or anything else like that, if your decisions within them don't matter for the multiverse at large.

None of the evolved concepts and heuristics, which you have been wired to assume so deeply alternatives may be literally unthinkable, are inapplicable in this kind of situation. These concepts include the self, anticipation, and reality. Anthropic is an heuristic as well, and a rather crappy one at that.

So ask yourself, what is your objective, non-local utility function over the entirety of the tegmark-4 multiverse, and for what action would it be logically implied to be the largest if all algorithms similar to yours outputted that action?