I found the source of the crash but sadly, I think I will need to restart the VN from scratch. The positive aspect is that I was going in a direction that probably would have taken me years before I released a demo and now I can restart with a better understanding of how the software works.
I think I'll restart it when I get a new PC which should be soon as this one is starting to strugle a bit with renders and is getting slow in general in the viewport. I'll just release the pictures and short animations I made in the near future.
Thank you everyone for your support and sorry for the time that this is taking