When the wave collapses you have chaos, semi-ordered chaos, and universes depending on the collapse.
Chaos is a palimpsest, an ouroboros, Black Friday.
Semi-ordered chaos is universe-like/chaos-like and ranges from almost chaos to almost a universe. For example, the number of dimensions can be fixed, the number of fundamental forces can be fixed but the strength of one or more fundamental forces can vary. One conceptual image is a spherical helix like this:
There is no multiverse but there is a conceptual multiverse. Imagine a sphere. The center of the sphere is the beginning of every universe and the surface is the end of every universe. Each universe is a slice of the sphere. Alternatively, think of the multiverse as a Choose Your Own Adventure book. At the start of the book, every possible story can happen but every choice narrows the number of possible stories. Each universe is a separate adventure. Confer Borges’ The Garden Of Forking Paths. Each universe is a separate hierarchical collapse of the uncollapsing probability wave that is reality. Because the wave collapses hierarchically, there can be no voluntary time travel, whether forwards, backwards or sideways.
Near the edges of the universe, there is a transition from the order of the universe to chaos. The universe is expanding into chaos.