> I’ve worked on a project for one year now

> What I am most concerned about is the maintainability of the project and how we will get this live.

I'm not sure if it's something that got "lost in translation" or whatever, but are you really saying this project has been under development for more than a year, yet no one attempted to deploy this to a live environment yet? If so, it's understandable you're concerned about it. A lot of the times when I jump on projects that got stuck in development hell in order to unblock them, this is a huge thing that gets in the way for teams. My approach usually is to focus on getting the whole "Know we want a change -> Implement change -> Deploy to test -> Testing -> Deploy to Production" process down first, before anything else, together with practicing at least one rollback.

It really ties into everything you do when working on a project, as this process itself basically decides how confident you can be about changes, and how confident you can be about that some bad changes can easily be rolled back even in production.

Besides that, having non-technical people trying to contribute to a technical project, is a great way for those people to unintentionally damage how well technical people can actually work on the project. I think, explaining to them exactly what you said here, that it isn't feasible long-term, that it's hard for you to have a clear mental model if they're just chucking 10K PRs at you and that you need to understand the code you deploy, should be enough to convince them. If it doesn't, you might want to ask yourself if that's the kind of environment you want to work in anyways.