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Have you considered telling both stories at the same time? Alternate chapters between the old and the new world. How the two worlds are related to each other can be left open in the beginning and ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/47294 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Have you considered telling both stories at the same time? Alternate chapters between the old and the new world. How the two worlds are related to each other can be left open in the beginning and explored throughout the story. You could even hide the fact that the respective protagonist is in fact the same person until later-on as a twist! Once the relationship between the two worlds has been established you can use alternating chapters to link events in the old world that motivate decisions in the new world in a flashback like construct. Alternating chapters also allow to create tension via cliff-hangers at the end of a chapter because the next chapter will be in the other world so the resolution will have to wait until the chapter after that.