I fully understand that it probably wasn't going to be paid. At the moment I'm just trying to get some experience under my belt, which is why I probably won't be able to help. I was wanting to work on some smaller projects, such as a game jam, but a full visual novel might be too ambitious for me at this time now that I've backed away for a bit and thought about it.
I recently started a platform rpg game, and I would like to focus on that as it is far more alike to what I am going to be making in my future, and it is much smaller in scope.
As a heads up, it costs money to put it on mobile. I'd honestly suggest putting it on Itch.io first, as it is free to do so. If you get some donations to pay for mobile fees, then do so. Ren'py makes it easy to put it on either. I don't know how to do ads on Ren'py though, so you might want to make sure you can.
As a side note, the way Ren'py is designed, it is increadibly easy to work with, and I'd honestly suggest just doing it yourself. Whoever uses Ren'py will need to be the one to write the story, as thats mostly all it is. Ren'py uses an increadibly simple coding language, that I would barely classify it as programming, as it is more just writing notation than anything else. Ren'py is a special software made for making Visual Novels, and it has most of the features you would need already functioning. Just fitz around with it for a bit, and you should get the hang of it really quickly, and just learn from there. Considering Ren'py is popular, you can probably find tons of tutorials all over the internet to help you work with it.
Thank you for your time,
Evelyn