Having problems with project exporting

I'm sure you guys are sick of hearing about media problems so I apologize for asking in advance but I need help! I have been looking on the internet for days on how to fix my problem and I can't find my solution anywhere. It's the same old story where when I try to export it fails immediately or at some point, never really being at the same spot. I've tried relinking media, I have storage on my device, I have 'stop renders when it can't be processed' on, I'm using proxies, all of it.

The odd thing is when I make an entirely new project I can use the footage fine but I don't want to do that as I've already completed the video and timelines that took weeks and would really like to not have to restart. I tried exporting the same project into a new project and it just picks up with the same issues. This has happened on past projects before where it randomly stops working when I don't touch the original files and I'm at a loss frankly.

ANY help or suggestions would be so so great, thank you