you should approach it from a position of ignorance
because that is where you start from
instead you are approaching it from knowing it is false
When I first heard about the Mandela effect, some years ago, I did approach it from a position of ignorance - I had no alternative!
When I considered the observed phenomenon, it was almost immediately clear that it was a well-known memory phenomenon with an empirically demonstrable explanation.
Other universes may well 'exist', and - given an infinity of universes, universes identical to ours but with trivial differences in their timelines. However, there is no indication that we will ever be able to detect other universes, let alone interact with them (the theories that posit their existence say no), and the idea of individuals unwittingly moving between them is pure science fiction.
But, let's assume, for the sake of argument, that you could randomly and unwittingly move between alternate universes without even noticing; the chances of your encountering a universe where your material body could exist for a millisecond would seem infinitesimally remote if the String Theory landscape is any guide.
But let's further assume, for the sake of argument, that the String Theory landscape is not a guide, and all the universes are spacetime universes with similar matter density and energy distribution to our own... In that multiverse, the number of universes identical in all respects similar to our own, except for some trivial change in candy wrapper spelling, or life/death of some individual would still be infinitesimal compared to all the universes with major differences, e.g. without the solar system, or the Earth, etc.
But let's further assume, for the sake of argument, that all those universes were identical to our own except for some extremely trivial differences... the chance of someone randomly and unwittingly moving between them and arriving in a time and place exactly corresponding to the time and place of her departure from the previous universe would be infinitesimally remote.
But let's further assume, for the sake of argument, that you would (somehow) always transfer to the corresponding time and place in the alternate universe... well, then you would literally bump into your alternate self - or materialise in the same space, which wouldn't be good.
The alternative would be for the alternate you in the alternate universe to swap universes with you, just by chance, at
exactly the same time that you arrived... the chances of that happening are also infinitesimally small you'd need to multiply that by the probabilities of each of you moving to the other's universe squared...
So it might make for exciting plotlines in comic-book science-fiction, but it's really pure fantasy.