Ah, now that itself it's not so easy. You'll need either a Mac or Rent a virtual Machine running macOS, some sources say you need to apply to the apple developer program but I believe you don't really need to if you're not planning to upload it to the AppStore, and after that there are some programs that could compile the project. The project itself you would need to test first if it works on the iOS emulator that renpy has, if it does then maybe it would be worth the try, there's an option to build an XCODE project from the project itself, and that project is the one that you should be able to compile into an .ipa file. Well writing it made me realize it's quite a big "if" and even then it could not work well on iOS and troubleshoot such a niche platform definitely doesn't seem worth it.
Keep up the good work man, you're one of the few that prevented the uncanny valley with your characters, and I never thought a game of this nature could have compelling characters and catchy story lines. Cheers to you.