Something I just want to point out, but it can be hard to progress as things get bigger. This is a common problem with programming, and is generally a mistake made by younger programmers. Basically, as things get bigger, and more and more things get added, it gets harder and harder to keep track of things, especially if you did not properly organize things. This also goes for story telling, and honestly, writing in general. It is not uncommon for programmers to be able to write a ton of code at the start of a project, but as the project gets larger, their speed starts slowing dramatically. This is due to a lack organization and disorganized code. What slows them down is that they will add something, and then a bunch of things will start breaking, they then need to go and fix all the things that broke. After fixing everything, they then go and add something new again, and even more things break. Rinse and repeat.
While I understand that what the dev is doing with renpy isn't what most people think of as "programming", it is, however, programming. It is extremely macro programming, but code is still involved, and as such is susceptible to the problems I have stated.
Dev, if you are reading this and you think what I have stated is indeed the problem, I would suggest watching a youtube series of lecture recordings called Clean Code with Uncle Bob. It may look a bit daunting, but I believe if you are indeed having these problems, then these videos would help you immensely.