ah the good old "imma remake the game code, so it is faster to make content!" spends more time doing that, ends up realizing how forked the code is, meaning it will take far longer. waste even more time making up to the point he left off, and even when finally its done remodeling, will still take as much time as before to release each update...
at this point i think porn game devs who try to pull this shit must either be insane, or in need of an excuse to abandon the project. because i cant see how they cant correlate this happening EVERY SINGLE TIME one of them tries to pull this shit, and it back fires in the exact same way...
let it be a lesson, if the game code is borked, just live with it, try to optimize what you can, and move on.
also, renpy is a good engine, but unless you are really good at it, stop trying to make massive games. go for smaller stuff, that is easier to handle.