Finding a mentor/supervisor

I have a general question about finding a mentor/supervisor to offer guidance in the process of writing an academic paper. I have the paper written - on the problem of time in Quantum Gravity. It's effectively a philosophical approach, whic is why I'm posting here as well. I think I've gone as far as I can on my own, which is where some guidance would be invaluable.

I know the structure and formatting probably need a lot of work. The paper is relatively well referenced, I would say, although there is probably a need for additional citations in places - some well known ideas I didn't reference - and the formatting of the citations themselves probably need some work. Some feedback/critique on the ideas would also be invaluable.

Unfortunately, enrolling in an educational program isn't a viable option a the moment. So, would anyone have any advice on how to proceed in this context?