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#TimeTravelAuthors 13: Multiverses?

In my cosmology the chances that you could go back to the same universe twice are infinitesimal- it's now a different branch, so no butterfly effect for you.
However, like Steins; Gate, there's an organization like SERN that tightly controls time travel, and they don't want you messing with the past (maybe on moral grounds). It's hyper-expensive, and they maintain their monopoly by any means necessary.
So you need a huge research grant or other source of funds, convince them it's a worthy project, and they're strict on maintaining a low profile.